Santa Maria City Council
October 21, 2025

SETT

LEMENT AGREEMENT AND RELEASE
This Settlement Agreement and Release ( hereinafter referred to as the “Agreement”) is entered into, by, between, and among respective petitioners and/or real parties in interest, the County of Santa Barbara (“COUNTY”), the Santa Maria Public Airport District (“AIRPORT DISTRICT”), and the City of Santa Maria (“CITY”) (collectively, “ LOCAL AGENCIES”) and respondent the California Regional Water Quality Control Board, Central Coast Region (“WATER BOARD”). The LOCAL AGENCIES and WATER BOARD are collectively referred to herein together as “PARTIES” and each singularly as “PARTY” based on the respective provisions herein.

RE
CITALS
A. WHEREAS the WATER BOARD is the lead agency with jurisdiction over the investigation and cleanup of the real property consisting of six parcels identified as Santa Barbara County Assessor Parcel Numbers 111-291- 035, 111-291-036, 111-291-037, 111-291-038, 111- 291-041, and 111-291-042 (the “Site”).

B. WHEREAS, on September 26, 2023, the WATER BOARD issued Cleanup and Abatement Order No. R3-2023-0070 (“CAO”) related to the former operations of SEMCO Twist Drill and Tool Company, Inc. (“SEMCO”) at the Site. The CAO contends that SEMCO operated a precision tool manufacturing business at the Site and used cutting oil (a petroleum hydrocarbon- based lubricant) and volatile organic compounds (“VOCs”), such as trichloroethylene (“TCE”) and 1, 1,1-trichloroethane (“TCA”), as degreasers to clean tools and metal parts. The COUNTY and CITY jointly owned the Site from 1949- 1964, during which ti me the Site was leased to SEMCO. The AIRPORT owned the Site from 1964-1968, during which time the Site was leased to SEMCO.

C. WHEREAS the CAO states that investigations have indicated that the Site is impacted with VOCs, petroleum hydrocarbons, and 1,4-dioxane in soil, soil gas, and groundwater.

D. WHEREAS the CAO identifies the LOCAL AGENCIES as dischargers responsible for the cleanup of the impacted soil, soil gas, and groundwater.

E. WHEREAS the PARTIES disagree on whether the LOCAL AGENCIES were properly named as dischargers in the CAO.

F. WHEREAS, on October 25, 2023, the AIRPORT DISTRICT filed a petition with the State Water Resources Control Board ( “STATE WATER BOARD”) for review of the CAO.

After the STATE WATER BOARD dismissed the petition by operation of law, on February 22, 2024, the AIRPORT DISTRICT filed a petition for writ of mandate and complaint for injunctive relief in the Superior Court, originally filed in the County of Santa Barbara and transferred to the San Luis Obispo County Superior Court as Case No. 24CV-0379 (“Airport Petition”).

Attachment B
G. WHEREAS, on October 26, 2023, the COUNTY filed a petition with the STATE WATER BOARD for review of the CAO. After the STATE WATER BOARD dismissed the petition by operation of law, on February 22, 2024, COUNTY filed a petition for writ of mandate in the Superior Court, originally filed in the County of Santa Barbara and transferred to the San Luis Obispo County Superior Court as Case No. 24CV-0391 (“County Petition”).

H. WHEREAS, on October 24, 2023, the CITY filed a petition with the STATE WATER BOARD for review of the CAO. After the STATE WATER BOARD dismissed the petition by operation of law, on December 19, 2024, CITY filed a petition for writ of mandate in the Superior Court, originally filed in the County of Santa Barbara and transferred to the San Luis Obispo County Superior Court as Case No. 25CV-0136 (“City Petition”).

I. WHEREAS the Airport Petition, County Petition, and City Petition are referred to herein collectively as “PETITIONS.”
J. WHEREAS the WATER BOARD intends to oppose the PETITIONS.

K. WHEREAS the CAO requires those named therein , including the LOCAL AGENCIES, to meet certain investigatory and cleanup deadlines for the Site, which is enforceable by the WATER BOARD under the Water Code and other statutes.

L. WHEREAS there is a stay of enforcement of the CAO as to the COUNTY and AIRPORT DISTRICT at least through October 13, 2025.

M. WHEREAS the PARTIES desire to avoid litigation and to resolve the differences between the PARTIES.

NOW, THEREFORE, solely for the purpose of settling the claims covered by this Agreement, and to avoid further judicial proceedings and the adjudication of certain issues of law and/or fact, and for no other purpose, in consideration of the mutual promises contained herein, and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the PARTIES hereby stipulate and agree as follows.

TERMS

1. EFFECTIVE DATE. This Agreement shall become effective as of the date the last signature set forth at the end of this Agreement.

2. PARTIES AND BINDING EFFECT.

2.1. This Agreement applies only between the PARTIES , and this Agreement and each provision herein shall be binding upon and inure to the benefit of each (WATER BOARD, COUNTY, CITY, and AIRPORT DISTRICT) and all of these PARTIES and, without limitation, their respective board/council members, officials, directors, officers, principals, staff, agents, representatives, attorneys, employees, departments, divisions, successors, successors-in-interest, assigns, and all persons acting by, at the direction of or in concert with them.

Attachment B

2.2. This Agreement covers and otherwise resolves the “Covered Matters,” which means the CAO, and any and all orders, directives, requirements, civil or administrative actions, and obligations of any kind, relating to any existing or future liability or to compel the LOCAL AGENCIES to perform environmental investigation and response actions to address the Existing Contamination, releases, or threatened releases of a hazardous substance at or originating from the Site , whether that action is onsite or offsite. The “Existing Contamination” means any hazardous substances, pollutants, or contaminants that, as of the Effective Date of this Agreement, have been released, discharged, disposed of, or otherwise placed at the Site that are present or existing on or under the Site, that originate from the Site, or that have migrated or threaten to migrate from the Site , as described in the CAO. The “Covered Matters” also includes any and all costs incurred or to be incurred by the WATER BOARD relating to the Site or this Agreement.

2.3. Nothing in this Agreement shall bind, obligate, or otherwise create any rights or duties applicable to or enforceable by, or impose any limitations or conditions upon, any discharger, person or entity that has not signed the Agreement, nor shall the Agreement be construed to make such person or entity a third-party beneficiary of the Agreement.

2.4. The PARTIES shall have the express authority to enforce all provisions of this Agreement, individually or collectively.

3. COMMITMENTS OF THE PARTIES.

3.1. Settlement Work. In consideration of and in exchange for the stay of enforcement of the CAO while the following work is performed and upon completion, the full and forever release and covenant not to sue in Section 4, the LOCAL AGENCIES agree to perform the following limited scope of work as described herein (“Settlement Work”), through the LOCAL AGENCIES’ joint consultant. The time schedule to implement the following Settlement Work (“Time Schedule”) is set forth in Exhibit “A” and appended to this Agreement.

3.1.1. SOIL VAPOR EXTRACTION (SVE). The scope of work is fully described in Exhibit “B” and appended to this Agreement. The SVE shall address the shallow zone (to the low permeability layer at the bottom of the perched zone at approximately 50-foot below ground surface depth).

A. Remediation Goals . The LOCAL AGENCIES shall operate the SVE System until one of the following remediation goals is reached. The “SVE System” is described in a workplan attached hereto as Exhibit “B”. i. 1 x 10-5 risk in soil gas concentrations using 0.01 attenuation factor (cleanup to a stable concentration of 3,000 µg/m3 TCE); or

Attachment B
ii. If a
fter two (2) years 1 x 10 -5 risk (3,000 µg/m3 TCE) in soil gas is not achieved, SVE operations may be discontinued once 1 x 10-4 soil gas risk (30,000 µg/m 3 TCE) is achieved, provided that vapor intrusion mitigation is installed and operational if greater than 1 x 10-5 vapor intrusion risk remains (e.g., sub-slab depressurization or equivalent is implemented). After the remediation goals identified herein are obtained and the scope of work in Exhibit B is completed, the SVE System shall be owned and the responsibility of the current owner(s) of the property on which the system is located at the Site, including any operation, maintenance, repairs, or otherwise, and the WATER BOARD shall not require the LOCAL AGENCIES to take any further actions regarding the SVE System.

B. Remediation Goal Measurement . The following measurements shall be used in progress reports and to determine the achievement of one of the above remediation goals.

i. Any and all measurem ents of soil gas concentrations will be made using the 95 percent upper confidence level of the mean concentration as reported for vapor wells, using existing vapor probes SV8, SV11, SV12, SV15, SV16, and SV17 and five (5) SVE wells that will be installed for SVE remediation , identified in the workplan attached hereto as Exhibit B.

ii. Any and all measurements of soil gas concentrations will be made after SVE system shutdown and a suitable “rebound” period, as defined in the workplan in Exhibit “B,” to allow for equilibration and measurement of representative and stable soil gas concentrations.

C. Startup and Reporting. The LOCAL AGENCIES shall install and startup the SVE System as soon as possible, but within the time set in the Time Schedule set forth in Exhibit A , which is intended to allow for design, permitting, and public participation. Following installation and start-up of the SVE System, and for as long as the system is operating, the LOCAL AGENCIES shall submit semi-annual progress reports, which shall include, at least (a) summary of SVE S ystem operations and maintenance, and (b) general evaluation of the SVE System’s performance with respect to the remedial goals identified herein. The progress reports shall be submitted to the WATER BOARD and uploaded to Geo Tracker (in accordance with California Code of Regulations, Title 23, Division 3, Chapter 30 and Title 27, Division 3, Subdivision 1, and Title 27, Division 3, Subdivision 2). The WATER BOARD may provide comments or recommendations but shall not Attachment B
re
quire any further action or make further directives to the LOCAL AGENCIES.

D. Cooperation and Changes in Conditions . The PARTIES have negotiated the scope of work to be a complete expression of the LOCAL AGENCIES’ obligations but acknowledge that there may be site conditions that could affect the ability of the LOCAL AGENCIES to perform the work.

Accordingly, the PARTIES also agree:

i. Public Participation. The PARTIES shall coordinate a public notice and public comment period of the interim remedial action consistent with the requirements of Health & Safety Code section 78930, to be published by the WATER BOARD.

ii. Groundwater Recharge. Should groundwater recharge make SVE infeasible in the perched zone at approximately 50-foot below ground surface depth, the LOCAL AGENCIES shall implement dual phase extraction to enable SVE to continue.

iii. SVE System Interruptions. Should operation of the SVE System be interrupted for more than 30 consecutive days or for more than 60 days in any 12- month period, not including the time that the SVE System is shut down for the suitable “rebound” period, then the two (2)-year operating period shall be extended by the same number of days of the interruption within that 12-month period.

3.1.2. DEEP GROUNDWATER ZONE ASSESSMENT AND MONITORING . The scope of work is fully described in Exhibit “C” and appended to this Agreement.

A. Vertical Profiling of City Supply Well 2AS . The LOCAL AGENCIES shall conduct a vertical profiling of Well 2AS to identify TCE, 1,4- Dioxane, and TPHg/TPHd across the well’s screen interval.

B. Deep Groundwater Monitoring Well Installation. The LOCAL AGENCIES shall install two (2) deep groundwater monitoring wells near the Site to investigate the offsite impacts, if any, for migration of contaminants that originated from the Site.

i. Ownership. The CITY shall own and maintain the se two deep groundwater monitoring wells until completion of the Settlement Work described in this section (3.1.2.) is completed.

Attachment B
ii. L
ocation of Wells. The PARTIES acknowledge that the two off-site deep groundwater monitoring wells will be place d on public property. The location or ownership of the wells is not intended to be an admission or construe separate liability of the LOCAL AGENCIES relating to ownership or operations of the real property upon which the wells are located for contamination originating from the Site.

iii. Status of Wells after Completion of Work. Once the Settlement Work described in this section (3.1.2.) is completed, the CITY may quit-claim or otherwise transfer ownership of the two wells to the current property owner(s) of the SEMCO Site or take other steps to transfer ownership of the wells t o other parties named in the CAO (other than the LOCAL AGENCIES) , who shall own and be
responsible for properly maintaining the wells. The COUNTY shall approve the form of any quitclaim or other ownership transfer conveyance for any well located on COUNTY property.

The CITY shall make a good faith attempt to transfer ownership of the wells to each of the parties named in the CAO. Should the transfer of ownership of the wells be accepted or rejected by one or more parties named in the CAO, the CITY and/or COUNTY shall notify the WATER BOARD.

If after the COUNTY and/or CITY provide notice to the WATER BOARD, and transfer of the wells have not been accepted by any other party named in the CAO (other than the LOCAL AGENCIES) within 365 days after the notice to the WATER BOARD, then the CITY may freely abandon, transfer, cap or otherwise cease utilization of each well in any manner i n which it sees fit. This period shall be tolled during any period in which the WATER BOARD has an administrative or judicial enforcement action pending to enforce the terms of the CAO or other orders concerning the contamination related to the Site issued by the WATER BOARD against parties other than the LOCAL AGENCIES.

C. Groundwater Monitoring.

i. Semi-Annual Deep Groundwater Well S ampling Events. The LOCAL AGENCIES shall conduct eight (8) groundwater
monitoring events over a four (4) -year period, on a semi -annual basis, to sample and gauge the depths to water each of the following wells: the two (2) groundwater monitoring wells that are to be Attachment B
i
nstalled by the LOCAL AGENCIES and groundwater monitoring well DW -1 located at the Mafi Trench facility (collectively, “Sampling Wells”).

ii. CITY Well 2AS Sampling Events. The LOCAL AGENCIES shall conduct two (2) groundwater monitoring events over four (4)-years (once every other year during the semi -annual sampling events) of CITY Well 2AS.

iii. Shallow Well Sampling Event. The LOCAL AGENCIES shall conduct one (1) groundwater monitoring event of all available onsite shallow perched groundwater monitoring wells prior to the SVE System startup.

iv. Sampling Methods . Sampling analytes shall include USEPA Method 8260B/C for VOCs and TPHg/TPHd by USEPA Method
8015M. In two (2) of the groundwater monitoring events, the timing of which i s set forth in Exhibit A , a general minerals sampling analysis shall also be performed.

v. Reporting. The LOCAL AGENCIES shall submit semi-annual groundwater monitoring reports to the WATER BOARD within thirty (30) days following each of the monitoring events and shall upload the groundwater data and reports to GeoT racker. The WATER BOARD may provide comments or recommendations but shall not require any further action or make further directives to the LOCAL AGENCIES.

3.1.3. TECHNICAL EVALUATIONS. The LOCAL AGENCIES shall submit to the WATER BOARD, and shall upload a copy to GeoTracker, the following technical evaluations by the deadlines set forth in the Time Schedule in Exhibit A. The LOCAL AGENCIES shall not be required to implement any work, repairs, or take any other action with respect to the groundwater treatment system or in response to the evaluation.

A. Existing Groundwater Treatment System Evaluation . A technical evaluation of the existing groundwater treatment system at the Site shall include at least details on what parts would need to be installed and other repairs that would need to be completed to make the system operable for groundwater pump and treatment of contaminated groundwater in the future.

Attachment B
B. F
uture Hydraulic Containment Evaluation. If after the second sampling event of the CITY Well 2AS, the detections are above 12 micrograms per liter, a technical evaluation of the use of Well 2AS for future hydraulic containment, including at least details on what work would need to be completed to have the well serve as a hydraulic containment well to prevent migration of contaminated groundwater beyond the Site boundaries in the future.

3.2. CEQA. Settlement Work being conducted pursuant to this Agreement shall be deemed as exempt from CEQA as it is being conducted in lieu of the Order, which and, as such, is exempt from the provisions of the Public Resource Code section 21000, et seq. in accordance with California Code of Regulations, title 14, section 15307 and 15308. The WATER BOARD, as the lead agency within the meaning of CEQA, shall submit a Notice of Exemption to the State Clearinghouse and to the Clerk of the County of Santa Barbara within five business days after this Agreement is fully executed, and to take all other steps necessary to comply with the requirements for exemption from CEQA.

3.3. Due Care. The LOCAL AGENCIES, and their contractors, shall exercise due care at the Site with respect to the Existing Contamination, and shall comply with all applicable local, State, and federal laws and regulations.

3.4. Modification of Time Schedule. The deadlines set forth in the Time Schedule herein may be extended by modification of Exhibit A by the WATER BOARD and LOCAL AGENCIES, and any of them . In accordance with section 10 of this Agreement, t he LOCAL AGENCIES must submit written notification to the WATER BOARD of any and all requests to extend a deadline in Exhibit A at least 60 days prior to the applicable deadline or shall state why 60 days-notice is not feasible, state the need for additional time, and propose modification(s) to Exhibit A. The WATER BOARD shall not unreasonably withhold consent to a modification of the deadline(s) in Exhibit A.

3.5. Cooperation. Should there be any changes in conditions not otherwise contemplated herein that affect the ability of the LOCAL AGENCIES’ performance of the Settlement Work, the Parties shall meet and confer subject to the dispute resolution procedures in this Agreement to address issues should they arise.

3.6. Stay of CAO Enforcement . Upon this Agreement taking effect and so long as the LOCAL AGENIES are in compliance with this Agreement , the WATER BOARD will stay enforcement of the CAO against the LOCAL AGENCIES, only, and shall not impose fines, penalties, require, direct, or order the LOCAL AGENCIES to take any other actions with respect to the Covered Matters while the Settlement Work and conditions of this Agreement are completed.

Attachment B

3.7. Dismissal of Petition and Tolling.

3.7.1. Good Faith Settlement Determination. Within thirty (30) days of this Agreement taking effect, the LOCAL AGENCIES may file a motion for good faith settlement determination in their respective Petitions. A copy of any and all orders from the court making a good faith settlement determination shall be provided to the WATER BOARD to be placed in the WATER BOARD’s public files, including on GeoTracker for the Site.

3.7.2. Dismissal without prejudice. Within ten (10) court days of a decision by the Court on the motion for good faith settlement, or if no motion is filed then within forty- five (45) days following the effective date of this Agreement, the LOCAL AGENCIES, respectively, shall file a reques t for dismissal without prejudice of the PETITIONS and with the court retaining jurisdiction. As stated elsewhere in this Agreement, the Court shall retain jurisdiction to enforce the settlement pursuant to California Code of Civil Procedure section 664.6.

3.7.3. Tolling of PETITION Claims. The PARTIES agree that the running of any and all applicable statutes of limitations, and any other statute, law, rule or principle of equity of similar effect, and any other time -related defenses or limitations on actions, including, but not limited to, the time limitations for filing any and all pleadings, petitions, commenc ing litigation, bring ing suit, or instituting proceedings (collectively, “Time Defenses”), with respect to any and all rights, claims, and causes of action that have accrued or may accrue that could or might be asserted by any PARTY that are based on, arise out of, or in any way relate to the facts and circumstances associated with the PETITIONS , including mandamus relief, shall be tolled and suspended during the Tolling Period.

3.7.3.1. The “Tolling Period” shall be in place until there is a “No Further Action” letter and notice of completion of the Settlement Work. The Tolling Period may be extended by mutual written agreement of the PARTIES. The PARTIES shall not withhold consent to an extension of the Tolling Period so long as the LOCAL AGENCIES are performing the Settlement Work.

3.7.3.2. The PARTIES agree that the time included in the Tolling Period shall be excluded from computing, and determining the applicability or validity of, any Time Defenses for any and all Claims.

3.7.3.3. The PARTIES agree that no litigation or other legal proceedings will be instituted between them with regard to the matters in the PETITIONS until expiration of the Tolling Period. This provision does not apply to, nor do the PARTIES intend to toll any claims for Attachment B
b
reach of this Settlement Agreement , which may be brought at any time consistent with the Dispute provisions herein.

3.7.3.4. The PARTIES may terminate this provision only upon the filing of a breach of the Settlement Agreement claim, and thereupon, the Tolling Period shall terminate ninety (90) days following receipt of the notice of the filing of the breach of contract claim, at which time all claims must be preserved through the initiation of litigation.

LOCAL AGENCIES may initiate litigation, suit or proceeding at any time during the ninety-day period.

3.7.3.5. The PARTIES agree that each shall not plead, assert, or otherwise raise any Time Defenses, to the extent such is tolled by this Agreement, as a bar to other limitations on any Claims and provided as long as such Time Defenses were not already barred as of the Effective Date of this Tolling Agreement.

3.7.3.6. This provision constitutes a valid and effective written agreement to toll pursuant to California Code of Civil Procedure section 360.5.

3.7.3.7. This “Tolling of PETITION Claims” section of the Agreement may be used by any Party in a court of law as an absolute bar to the assertion of any position contrary to the terms of this provision.

3.7.3.8. Upon issuance of a notice of completion of the Settlement Work and No Further Action Letter, the PETITION Claims shall be
extinguished as a matter of law on the date of the No Further Action Letter.

3.8. Notice of Progress and Completion of Settlement Work . The LOCAL AGENCIES shall provide notices of progress and completion of the respective scopes of the Settlement Work, which may be in the form of the reports as required above. Within thirty (30) days of a notice of completion of any portion of the Settlement Work as well as a notice of final completion, the WATER BOARD shall provide a notice of determination of completion, confirming that the Settlement Work has been fully performed. Upon the LOCAL AGENCIES’ notice of final completion of all scopes of the Settlement Work, the WATER BOARD shall provide concurrence on the completion and a “No Further Action” determination. If the WATER BOARD determines that any such Settlement Work has not been completed in accordance with this Agreement, the WATER BOARD shall notify the LOCAL AGENCIES in writing and provide a detailed list of the deficiencies. The LOCAL AGENCIES may either correct the stated deficiencies, or if disputed, the PARTIE S shall follow the dispute procedure set forth in this Agreement.

Attachment B

4. WATER BOARD’S RELEASE AND COVENANTS NOT TO SUE.

4.1. In consideration for the LOCAL AGENCIES’ promise and performance described herein, and effective upon complete performance of the Settlement Work described in Section 3 of this Agreement, the WATER BOARD does hereby:

4.1.1. Remove the LOCAL AGENCIES, and each of them, from the CAO for the Site , and upon removal, promises not to take any further or future action or enforcement as to the LOCAL AGENCIES only, relating to the Covered Matters, whether such actions are onsite or offsite.

4.1.2. Release and forever discharge the LOCAL AGENCIES, together and separately, and each of them, from all known and unknown civil and administrative actions, orders, directives, complaints, claims, charges, liabilities, obligations, promises, agreements, controversies, damages, actions, causes of action, suits, rights, demands, costs, losses, debts, penalties, fines, oversight costs, fees, and expenses (including attorneys’ fees and costs actually incurred), of any nature whatsoever, whether at law or in equity, or known or unknown, which the WATER BOARD has, or may have had, against the LOCAL AGENCIES, whether or not apparent or yet to be discovered, or which may hereafter develop, for any acts or omissions related to or arising from the Covered Matters. This release expressly covers, but is not limited to, any and all direct or indirect claims and administrative and regulatory authority that could be exercised pursuant to the California Water Code (including but not limited to sections 13000, et seq ), California Health & Safety Code (including but not limited to Division 45, Part 2, sections 78000, et seq ), Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), 42 U.S.C. § 9601, et seq , and Resource Conservation and Recovery Act (RCRA), 40 CFR § 239, et seq. This Agreement resolves any and all claims for relief relating to or arising from the Covered Matters that has or could have been alleged by the WATER BOARD against the LOCAL AGENCIES, and each of them, no matter how characterized, including, without limitation, compensatory damages, damages for breach of contract, penalties, bad faith damages, reliance damages, liquidated damages, damages for humiliation and embarrassment, punitive damages, costs, and attorneys’ fees.

4.2. The covenants and promises made herein shall not be contingent on the outcome, data, results, and/or detections of any contaminant or constituent. This means that even if there are actionable detections of contamination, including but not limited to any im mediate, imminent and/or substantial impact or endangerment, that this Agreement shall remain operative and enforceable. As stated elsewhere in this Agreement, this Agreement does not inure to third parties and thus, the WATER BOARD shall retain all powers to enforce the CAO and any other obligations as to any other named “discharger” except the LOCAL AGENCIES.

Attachment B

5. CITY’S RESPONSIBILITY FOR ITS WATER SUPPLY WELLS . If hazardous substances originating from the Site impact any of the CITY’s drinking water supply wells, then the CITY shall be responsible for addressing and treating any hazardous substance pollution within its drinking water supply wells (e.g., through wellhead treatment, or otherwise, at the discretion of the CITY ). T he CITY shall not request assistance from the WATER BOARD for replacement water pursuant to Water Code section 13304 for impacts related to this Site. Nothing in this provision is intended to be an admission or construe separate liability of the CITY relating to ownership or operations of its drinking water supply wells for contamination originating from the Site.

6. JUSTIFIABLE RELIANCE. The PARTIES acknowledge and agree that the PARTIES, and each of them, are justifiably and reasonably relying upon the terms and conditions set forth in this Agreement, and that this Agreement is enforceable in accordance with its terms.

7. COOPERATION.

7.1. The LOCAL AGENCIES have executed a separate, related agreement for the cooperation, coordination, and assistance of each other in implementing the terms of this Agreement, including, but not limited to, providing technical, monetary, and/or administrative support to implement the terms of this Agreement (the “ Common Interest Agreement”). As memorialized in the Common Interest Agreement and any amendment thereto , t he COUNTY and CITY shall be responsible for ensuring and facilitating the LOCAL AGENCIES’ obligations relating to the Settlement Work set forth in this Agreement, including but not limited to communications, coordination, and cooperation with the WATER BOARD. The AIRPORT DISTRICT shall not be responsible for, nor actively participate, in facilitating the performance and completion of the Settlement Work.

7.2. The LOCAL AGENCIES may implement their obligations under the terms of this Agreement in conjunction with, or through, an agent(s) or independent contractor(s) selected by the LOCAL AGENCIES. The LOCAL AGENCIES shall retain sole discretion to hire and fire any such agent or independent contractor.

7.3. The WATER BOARD shall cooperate and assist the LOCAL AGENCIES with sufficient access to the Site and Mafi Trench site. Should it be necessary, the WATER BOARD agrees that it will use all authority provided to it by law (including but not necessarily limited to, Water Code § 13304) to obtain sufficient access to the Site for the LOCAL AGENCIES to perform their obligations under this Agreement. The PARTIES acknowledge and agree that the LOCAL AGENCIES, or any of them, shall not be deemed to be in breach of this Agreement if the Settlement Work cannot be completed due to an inability of the PARTIES to access the Site.

Attachment B

7.4. At least five (5) days prior to commencement of any portion of the physical Settlement Work that will take place on the Site, the LOCAL AGENCIES, which may be done through their consultant, shall give notice to the WATER BOARD. Upon reasonable notice thereafter, the WATER BOARD shall be authorized to access any portion of the Site that may be subject to the Settlement Work and over which the LOCAL AGENCIES, or any of them, have the authority to grant such access. The WATER BOARD shall have the right to photograph, sample, and monitor the Site for the purposes of ensuring compliance with this Agreement. The LOCAL AGENCIES shall have the right to obtain copies of all photographs, sampling data reports/analyses, and notes taken by the WATER BOARD during such Site inspection.

8. CONTRIBUTION PROTECTION.

8.1. With regard to claims for contribution against the LOCAL AGENCIES, the PARTIES agree that this Agreement is an administrative settlement for purposes of Section 113(f)(2) of CERCLA, 42 U.S.C. § 9613(f)(2) and the Hazardous Substance Account Act (HSAA), California Health and Safety Code § 79920(b) , and that the LOCAL AGENCIES are entitled to protection from contribution actions or claims under CERCLA, HSAA, or as may be otherwise provided by law, for the Covered Matters in this Agreement to the fullest extent permitted by law.

8.2. The LOCAL AGENCIES may file a motion for good faith settlement determination of their respective PETITIONS. The WATER BOARD shall not oppose the motion. The PARTIES acknowledge and agree that this motion is made as an additional protection of the LOCAL AGENCIES against third party claims. However, this Agreement is not contingent on the Court’s determination of a good faith settlement and shall still be effective without such finding.

8.3. Nothing in this Agreement, precludes or limits any of the PARTIES from seeking cost recovery or other claims brought against third parties (i.e., parties other than the PARTIES covered in this Agreement), including but not limited to, cost recovery or contribution under 42 U.S.C. §§ 9607, 9613.

9. NO ADMISSION OF LIABILITY.

9.1. Nothing in this Agreement is intended, shall constitute, or be construed as an admission or concession of guilt, fault, or liability on the part of any of the PARTIES, nor shall it be construed as an admission of the existence or non- existence of any fact. Neither this Agreement, nor any part of the negotiations had in connection herewith shall constitute evidence, a waiver of any right or defense, an estoppel, or an admission of any matter of law or fact either as among the PARTIES or with respect to any person or entity not a party to this Agreement.

Attachment B

9.2. This Agreement will not be admissible for any purpose other than (1) to support the LOCAL AGENCIES’ motion for good faith settlement determination; (2) pursuant to California Evidence Code section 1123, and without objection, for the sole purpose of interpreting and enforcing the Agreement, if needed; (3) to rebut a defense or to defend against any claim, action, or other proceeding that may be brought, instituted or taken by one of the PARTIES against the other in breach of this Agreement; and ( 4) to establish, rebut, defend any third party claim for contribution and/or to invoke the contribution protections contained in this Agreement.

9.3. The PARTIES acknowledge and agree that t he fact that the LOCAL AGENCIES are agreeing to perform this scope of work, and any evidence of the work (including but not limited to work plans, data, reports, records, lab reports, field notes, logs, figures, maps, analysis, conclusions or any other indicia or record) do not constitute an admission or waiver by the LOCAL AGENCIE S of any rights or legal theories that could have been raised in the PETITIONS . The PARTIES understand and expressly acknowledge that this shall not be used to argue that the LOCAL AGENCIES were, at any time, properly named in the CAO.

10. NOTICES. Any notice, request, demand, consent, approval or other communication required or permitted hereunder or by law shall be deemed given or made only if in writing by mail and email addressed as follows, or to such other address as may, from time to time, be designated by written notice to the other PARTIES, as follows. Any PARTY may designate, but notice to all of the other PARTIES, substitute addresses or addressees for notices , which shall not be subject to the modification provision of this Agreement , an d thereafter, notices are to be directed to those substitute addresses or addressees. At the time of this Agreement, notice are as follows:

WATER BOARD:

Attn: Ryan Lodge, Executive Officer
895 Aerovista Place, Suite 101
San Luis Obispo, CA 93401
Email: [email protected]

Sophie N. Froelich
Office of Chief Counsel, State Water Resources Control Board 1001 I Street, 22nd Floor
Sacramento, CA 95814
Email: [email protected]

Dylan C. Redor
Office of the Attorney General of California
300 S. Spring St.

Los Angeles, CA 90013
Email: [email protected]
Attachment B
C
OUNTY:

Ted Teyber
County of Santa Barbara – General Services
Santa Barbara, CA 93101
Email: [email protected]

Christine M. Monroe
County Counsel’s Office, County of Santa Barbara
105 E. Anapamu Street, Suite 201
Santa Barbara, CA 93101
Email: [email protected]

CITY:

City of Santa Maria
Attention: City Manager
110 E. Cook Street
Santa Maria, California 93454

Office of City Attorney
Attention: Thomas Watson
204 E. Cook Street
Santa Maria, California 93454
Email: [email protected]

AIRPORT DISTRICT:

Martin Pehl, General Manager
3217 Terminal Drive
Santa Maria, CA 93455
Email: [email protected]

Josh George
Adamski Moroski Madden Cumberland & Green LLP
P.O. Box 3835
San Luis Obispo, CA 93403-3835
Email: [email protected]

11. AUTHORITY AND VOLUNTARY EXECUTION. Each of the individuals signing this Agreement represents and warrants their full power and authority to bind the party on whose behalf they sign, and that this Agreement as so executed will be binding upon each of the PARTIES. The PARTIES represent that they have carefully read this Agreement, know its contents, and freely and voluntarily signed it.

Attachment B

12. JOINT PREPARATION. Each of the PARTIES hereto has cooperated in the drafting and preparation of this Agreement through their respective counsel, and said counsel has carefully reviewed and examined this Agreement for execution by said PARTIES, or any of them .

Therefore, the Agreement shall be construed as if all the PARTIES jointly prepared it, and any uncertainty or ambiguity in the Agreement shall not be interpreted against any one Party.

13. ENTIRE FINAL AGREEMENT. The PARTIES acknowledge that this Agreement and its reduction to final form is the result of extensive good faith negotiations between the PARTIES through their respective counsel . This Agreement contains all of the terms and conditions agreed upon by the PARTIES relating to the Covered Matters by this Agreement, and supersedes any and all prior and contemporaneous agreements, negotiations, correspondence, understandings, and communications of the PARTIES, whether oral or written, respecting the Covered Matters by this Agreement.

14. COUNTERPARTS AND SIGNATURES. This Agreement may be executed in any number of counterparts, and each of such counterparts shall for all purposes be deemed to be an original, and all such counterparts shall together constitute one and the same instrument. The PARTIES agree that facsimile and electronic signatures will be treated in all respects as having the same effect as an original signature. The PARTIES agree that this Agreement will be considered signed when the signature of a Party is delivered by hand, by mail, by facsimile, or by e-mail transmission.

15. SURVIVAL. That the representations set forth in this Agreement shall endure forever and shall survive the execution of this Agreement and the settlement and dismissals of the PETITIONS.

16. SEVERABILITY. If any provision of this Agreement is determined to be unenforceable for any reason, it shall be adjusted rather than voided, if possible, in order to achieve the intent of the Parties. In any event, the remaining provisions shall be deemed valid and enf orceable to the maximum extent possible.

17. GOVERNING LAW. This Agreement shall be interpreted, construed, governed and enforced under and pursuant to the laws of the State of California. Any litigation regarding this Agreement or its contents shall be filed in the County of San Luis Obispo.

18. MODIFICATIONS. This Agreement may not be amended or modified, except by a written instrument signed by all of the PARTIES.

19. DISPUTES, ENFORCEMENT, AND REMEDIES. If any dispute arises between or among the PARTIES regarding this Agreement or any of the obligations herein, the PARTIES shall resolve any such dispute using the following dispute resolution procedures:

Attachment B

19.1. The PARTIES shall attempt to resolve any disagreements concerning this Agreement expeditiously and informally. To ensure that the meet and confer process is as productive as possible, the aggrieved PARTY shall first notify the other PARTIES in writing, setting forth the basis for its position and to set a meeting. The other PARTIES shall provide a written response, if any, within ten (10) days.

Thereafter, the PARTIES shall meet and confer in person or via videoconference to attempt to resolve the matter without, and prior to seeking judicial intervention.

19.2. Any agreement reached by the PARTIES pursuant to this Section shall be in writing and shall, upon signature by each of the PARTIES, be incorporated into and become an enforceable part of this Agreement.

19.3. If after sixty (60) days of initiating the meet and confer process the PARTIES are unable to resolve their dispute, any PARTY may seek judicial intervention and determination by a court of competent jurisdiction. Nothing in this provision requires that any PARTY seek judicial intervention within a certain time period, and the PARTIES may continue to attempt to resolve the matter without judicial intervention.

19.4. Pursuant to California Code of Civil Procedure section 664.6, the Court shall retain jurisdiction over the PARTIES to interpret and enforce the settlement and/or this AGREEMENT.

20. NO ATTORNEY FEES AND COSTS. The PARTIES agree that each will be responsible for its own expenses, including attorney’s fees and costs, in connection with the enforcement of this Agreement.

21. EXHIBITS.

A. Settlement Work Time Schedule
B. Workplan for Onsite Soil Vapor Extraction
C. Offsite and Onsite Groundwater Characterization Work Plan

IN WITNESS WHEREOF, the PARTIES have entered into this Agreement as of the Effective Date set forth above.

CALIFORNIA REGIONALWATER QUALITY

CONTROL BOARD, CENTRAL COAST REGION

By: _______________________________
Title: ______________________________
Date: ______________________________
Attachment B
CI

TY OF SANTA MARIA

By: _______________________________
Title: ______________________________
Date: ______________________________

SANTA MARIA PUBLIC AIRPORT DISTRICT

By: _______________________________
Title: ______________________________
Date: ______________________________

COUNTY OF SANTA BARBARA

By: _______________________________
Title: ______________________________
Date: ______________________________
Attachment B
EX

HIBIT A

SETTLEMENT WORK TIME SCHEDULE

Soil Vapor Extraction
Scope of Settlement Work Deadline
Start-up
- Design
- Public Participation
- Permitting
- Completion Reports

Within 400 days of the effective date of the
Agreement, subject to extension if air permit
not issued within 180 days of application
submittal.

Semi-Annual Progress Reports Due semi-annually, for as long as the system is in operation, on or by:

• April 30 – first semi-annual report for
October to March;
• October 31 – second semi -annual
report for April to September.

Groundwater Monitoring
Scope of Settlement Work Deadline
Well Installation
- Design
- Permitting
- Completion Reports

Within 150 days of the effective date of the
Agreement, subject to extension if off -site
permitting requires more than 60 days.

Semi Annual Sampling of two new wells and
Mafi Trench well (8 events total)

Semiannually, for approximately four years
until 8 events:

• First Quarter (October to March)
• Third Quarter (April to September)

Semi-Annual Reports (8 reports total) Semiannually, for approximately four years until 8 reports are submitted, on or by:

• April 30
• October 31

Attachment B
Sampling of available shallow onsite wells (1
event total)

Within 150 days of the effective date of the
Agreement and shall be included in the first
groundwater monitoring report.

Vertical Profiling of City Well 2AS (1 event
total)

Within 150 days of the effective date of the
Agreement and shall be included in the first
groundwater monitoring report.

Sampling of City Well 2AS (2 events total) Event 1: Within 150 days of the effective date of the Agreement and included in the first
groundwater monitoring report; and

Event 2: Shall be sampled during 6 th semi-
annual groundwater monitoring event and
included in the 6 th semi-annual groundwater
monitoring report.

Mineral Sampling of two new wells and Mafi
Trench well (2 events total)

Event 1: Within 150 days of the effective date
of the Agreement and included in the first
groundwater monitoring report; and

Event 2: Shall be sampled during 4 th semi-
annual groundwater monitoring event and
included in the 4 th semi-annual groundwater
monitoring report.

Technical Evaluations
Scope of Settlement Work Deadline
Existing Groundwater Treatment System
Evaluation

Within 270 days of the effective date of the
Agreement.

Future Hydraulic Containment Evaluation If necessary, within 120 days following the 6th semi-annual groundwater monitoring report, in
which the sampling results of City Well 2AS
are included.

Attachment B

OFFSITE AND ONSITE GROUNDWATER

CHARACTERIZATION WORK PLAN
for
2936 Industrial Parkway
Santa Maria, California

Prepared For:

The County of Santa Barbara,
The City of Santa Maria,
& The Santa Maria Public Airport District

Prepared By:

Langan CA, Inc.
104 West Anapamu St # 204B
Santa Barbara, California 93101

Christina Rain, PE
Senior Project Manager

Dorinda Shipman, PG, CHG
Principal

19 September 2025
781016901

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025
Page i

TABLE OF CONTENTS

1.0 INTRODUCTION ................................ ................................ ................................ ............ 1

2.0 BACKGROUND ................................ ................................ ................................ ............. 1

2.1 Site Location ................................ ................................ ................................ ........ 1

2.2 Relevant Nearby Property Information ................................ .............................. 2

2.3 Site History................................ ................................ ................................ ........... 2

2.4 Geology and Hydrogeology ................................ ................................ ................ 2

2.4.1 Geology ................................ ................................ ................................ ..... 3

2.4.2 Hydrogeology ................................ ................................ ........................... 4

2.5 Known Extent of VOCs in Deep Water-Bearing Zone ................................ ....... 4

3.0 PROPOSED SCOPE OF WORK ................................ ................................ ..................... 5

3.1 Mobilization ................................ ................................ ................................ ......... 5

3.1.1 Access, Survey, Permitting, and Health and Safety Plan ....................... 5

3.1.2 Utility Clearance ................................ ................................ ....................... 6

3.2 Groundwater Well Installation, Development, and Sampling .......................... 6

3.2.1 Groundwater Well Installation ................................ ................................ 6

3.2.2 Groundwater Well Development ................................ ............................ 7

3.2.3 Well Survey................................ ................................ ............................... 8

3.2.4 Decontamination and Waste Management ................................ ............ 8

4.0 SAMPLING AND ANALYSIS PLAN/QUALITY ASSURANCE PROJECT PLAN ........... 8

4.1 Sampling and Analysis Plan ................................ ................................ ................ 8

4.1.1 Depth to Groundwater Measurements ................................ ................. 9

4.1.2 Groundwater Sampling Methodology and Laboratory Analysis .......... 9

4.1.3 Alternative Sampling Approach: Passive Sampling .............................10

4.1.4 Vertical Profiling at Municipal Supply Well 2AS ................................ ...11

4.2 Quality Assurance Project Plan ................................ ................................ ..........11

4.2.1 Field QA/QC Procedures ................................ ................................ ............11

4.2.2 Laboratory QA/QC Procedures ................................ ............................... 12

5.0 REPORTING................................ ................................ ................................ ..................13

6.0 IMPLEMENTATION SCHEDULE ................................ ................................ ..................14

7.0 REFERENCES ................................ ................................ ................................ ...............15

FIGURES
TABLES

APPENDICES

781016901.02 Offsite Deep Groundwater Investigation Work Plan_2936 Industrial Parkway

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025
Page ii

FIGURES
Figure 1 – Site Location Map
Figure 2 – Site Plan
Figure 3 – Site Plan with Deep Water-Bearing Zone Groundwater Exceedances Figure 4 – Proposed Offsite Deep Water-Bearing Zone Monitoring Well Locations Figure 5 – Monitoring Well Construction Diagrams

TABLES
Table 1 – Proposed Well Construction Details
Table 2 – Historical Groundwater Elevations for Deep Water-Bearing Zone Monitoring Wells Table 3 – Historical Groundwater Analytical Results for Deep Water -Bearing Zone Monitoring Wells
Table 4 – Sampling and Analysis Plan

APPENDICES
Appendix A – Table A1, Existing Well Construction Details for Deep Water-Bearing Zone and Well Completion Logs and Boring Logs for Deep Water-Bearing Zone Appendix B – Historical Geological Cross-Sections

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
22 September 2025

1.0 INTRODUCTION
On behalf of the County of Santa Barbara (COSB), the Santa Maria Public Airport District (SMPAD), and the City of Santa Maria ( City), Langan has prepared this Offsite and Onsite Groundwater Characterization Work Plan (Work Plan) for the former SEMCO Twist Drill and Tool Company, Inc., (SEMCO) Site located at 2926, 2936, 2946, 2956, 2976, and 2986 Industrial Parkway in Santa Maria, California (the “ Site”) (Figure s 1 through 3). The California Regional Water Quality Control Board, Central Coast Region (“Central Coast Water Board”) has identified the Site as Case No. S28 (SLT3S2411351).

This Work Plan provides the scope of work for the installation of two offsite deep groundwater monitoring wells ( Table 1 and Figures 4 and 5 ), as required by the Settlement Agreement , SEMCO (COSB/SMPAD/CSM v. Water Boards) (Settlement Agreement ). This Work Plan also provides the Sampling and Analysis Plan/Quality Assurance Project Plan (SAP/QAPP) for baseline and semi-annual groundwater monitoring of shallow/perched zone wells and deep water-bearing zone wells, also in accordance with the Settlement Agreement.

This Work Plan is organized as follows: Section 2.0 Background; Section 3.0 Proposed Scope of Work; Section 4.0 Sampling and Analysis Plan/Quality Assurance Project Plan ; Section 5.0 Reporting; Section 6.0 Implementation Schedule; and Section 7.0 References for the Work Plan.

2.0 BACKGROUND

2.1 Site Location
The Site is approximately 7.31 acres in size and is comprised of six parcels (COSB Assessor’s Parcel Numbers [APNs] 111-291-035 through 111 -291-038, 111-291-041, and 111 -291-042) located in Santa Maria east of the Santa Maria Public Airport (Figures 1 through 3). Santa Maria is situated in a valley north of Orcutt, California, and south of the Santa Maria River. The valley is bordered on the west by the Casmalia Hills and Pacific Ocean and to the east by the San Rafael Mountains and the Los Padres National Forest. The Site slopes gently from north to south at an approximate elevation of 240 to 236 feet above mean sea level.

The Site is bounded by Industrial Parkway and commercial/industrial businesses to the west, commercial/industrial businesses to the north and south, and the Santa Maria Valley Railroad Trail followed by the Santa Maria Country Club to the east. Parcel 111-291-037 at 2936 Industrial Parkway is located on the western side of the Site where the historical SEMCO facility is located.

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

An inactive onsite City municipal water supply well (Well 2AS), which was shut down in 1985, is located near the southern Site boundary (Figures 2 and 3). Apart from an easement to Well 2AS, the COSB, SMPAD, and City do not own or control the Site.

2.2 Relevant Nearby Property Information
The surrounding area consists of a park, athletic fields, the Santa Maria Airport, and various industrial and commercial buildings. No schools, hospitals, residential areas, or other sensitive receptors are present within 1,000 feet of the Site. The nearest residential neighborhood is east of the Santa Maria Country Club over 1,000 feet from the Site. The Mafi Trench Corporation site at 3037 Industrial Parkway is the location of groundwater monitoring well MAFI-DW-1, which is approximately 410 feet southwest of the Site (Figure 4).1

2.3 Site History
As described by the Order No. R3-2023-0070 (Order), the Site was developed in 1942, when it began operation as the Santa Maria Lompoc Army Air Base until 1946. From approximately 1949 to 2001, the Site was occupied by a tool manufacturing business producing precision drilling bits and related cutting tools operated by SEMCO. During disputed time periods, SEMCO used cutting oil (a petroleum hydrocarbon -based lubricant), trichloroethene (TCE), and 1,1,1-trichloroethane (1,1,1 -TCA) onsite during its operations . VOCs were reportedly stored onsite in aboveground stor age tanks (ASTs) and the cutting oil was stored in an underground sump. The U.S. Army had at least two underground storage tanks (USTs) on the property (T1242 and T1273). Based on previous sampling results available on GeoTracker indicating elevated concentrations of total petroleum hydrocarbons, TCE and 1,1,1 -TCA, the Central Coast Water Board suspects SEMCO discharged waste on the property. Former municipal supply Well 2AS was reported to have a TCE concentrations of up to 59 micrograms per liter (µg/L) between 1984 and 1985, above the drinking water standard of 5 µg/L 2 (Cleanup and Abatement Order No. R3- 2023-0070 Former SEMCO Twist Drill and Tool Company, Inc. et al., 2023).

2.4 Geology and Hydrogeology
Geologic and hydrogeologic information for the Site is described below. Boring logs for the deep water-bearing zone and historical geological cross-sections are provided in Appendices A and B,

1 https://geotracker.waterboards.ca.gov/profile_report?global_id=SLT3S0301290 2 California State Water Resources Control Board (SWRCB) Drinking Water Maximum Contaminant Levels (MCLs) (November 2024).

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

respectively.

2.4.1 Geology
The Site is located in the Santa Maria Valley in the County of Santa Barbara, California. The regional geology consists of Pliocene to recent fluvial river channel deposits, alluvium, and terrace deposits with the Orcutt and Paso Robles formations and tertiary rocks and terrestrial sand dunes at higher elevations . Various tectonic events created the California Coast Ranges and the Transverse Ranges of Southern California, which are present to the south, west and east of the Santa Maria Valley (Worts, 1951).

Subsurface lithology at the Site has been identified as the following based on past investigation activities (ACG, 2021 and boring log for 2AS in Appendix A):
• The uppermost unit (Unit 1) from the ground surface to approximately 38 to 40 feet below ground surface (bgs) consists of clayey fine- to medium-grained sand and silty fine-grained sand, to a well-sorted fine- to medium-grained sand, light brown to tan color. Minor lenses of clayey silt and silty clay up to 6 inches thick are found within this unit, particularly at approximately 15 feet bgs.
• The upper middle lithologic unit (Unit 2) has a boundary with the uppermost unit at approximately 38 feet bgs and ranges in thickness from approximately 8 to 20 feet. The lithologic composition of this unit is variable, consisting of interlayered clayey sand, sandy silt, sandy clayey silt, and silty clay. Minor amounts of clean fine- to medium-grained sand, clay, and clayey gravel exist throughout the unit.
• The lower middle lithologic unit (Unit 3) extends from approximately 57 to 125 feet bgs and consists of poor to well sorted, medium- to coarse-grained sand with minor gravelly layers. Sandy clay to clay lenses of up to 5 feet thick are present throughout the unit, but do not appear to be laterally extensive. Cobble clasts are also present throughout this unit.
• The lowermost lithologic unit (Unit 4) encountered in investigations to date dominantly consists of poorly to well-sorted sandy gravel and clayey, sandy gravel, and gravel. Gravel size ranges from pea gravel to cobbles. Lenses of brown to tan, poorly sorted, silty, fine- to medium-grained sand and silty clay are present throughout the unit. The base of this unit was not penetrated, but reportedly extends to at least 248 feet bgs.

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

2.4.2 Hydrogeology
The Site is located within the Santa Maria River Valley Groundwater Basin (CA Department of Water Resources [ DWR], 2004), which generally consists of unconsolidated gravel, sand, silt, and clay in undifferentiated alluvial, river channel, and dune sand deposits. Groundwater occurs in at least two distinct saturated zones (Appendix B) : a perched water -bearing zone ( Unit 1, shallow water-bearing zone), with groundwater present from approximately 10 feet bgs to a clay or hardpan (aquitard, Unit 2), located at approximately 40 to 50 feet bgs and a deeper, regional water-bearing zone (deep water -bearing zone) at approximately 210 feet bgs , Unit 4 .

Groundwater flow beneath the Site is inferred to be to the south in the deep zone based on reported groundwater elevations in nearby water supply wells (Figure 4). The groundwater underlying the Site has designated beneficial uses, including agricultural water supply, municipal and domestic water supply, and industrial use (CCRWQCB, SWRCB, and CalEPA, 2019).

During investigations for VOCs, petroleum hydrocarbons, and 1,4 -dioxane, multiple onsite groundwater monitoring wells were installed and sampled. Between 1987 and present, first encountered groundwater in the onsite perched/shallow zone was observed between 7 and 35 feet bgs , and first encountered groundwater in the deep groundwater -bearing zone was observed between 127 and 190 feet bgs. Groundwater is encountered inconsistently in the perched/shallow zone, with several wells exhibiting dry conditions across the various monitoring events. During the most recent monitoring event in 2021 (ACG, 2021), shallow groundwater was observed at variable depths between 10 and 34 feet bgs, and the deep monitoring wells (DMW-1 to DMW-5) were dry indicating the deep-zone groundwater was below the bottom of the wells.

Depth to water measurements in 2024/2025 showed water present at approximately 185-feet in 2AS and 191-feet in MAFI -DW-1, to the south. Therefore, this Work Plan has been developed based on depth to groundwater of approximately 190 to 220 feet bgs in the areas south of the Site. Historical groundwater elevations for deep water-bearing zone monitoring wells relevant to this work plan are provided in Table 2.

2.5 Known Extent of VOCs in Deep Water-Bearing Zone
Historical groundwater analytical results for deep water -bearing zone monitoring wells are provided in Table 3. Groundwater monitoring was conducted in the four deep zone groundwater wells onsite (DMW-1 through DMW-4) in 1990, 1991, 1998 and 2003. DMW-5 was discovered in 2021 during a groundwater monitoring well investigation, but was noted as dry (ACG, 2021).

Langan does not have access to well construction information for DMW -5. TCE was detected above the California drinking water maximum contaminant level (MCL) of 5 µg/L in DMW-2 and Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

DMW-3, with a maximum detected concentration of 1,200 µg/L. 1,2 -dichloroethane, c is-1,2- dichloroethene and 1,4-dioxane were also detected above MCLs or notification level s (NLs) in DMW-2 in 2003. TCE has also been present in groundwater above MCLs at former supply well 2AS, located in the southern portion , and MAFI-DW-1, located 410 feet southwest of the Site.

Water supply well 2AS was sampled for TCE in 1985, with a concentration of 59 µg/L, and was promptly removed from the local water supply network. MAFI-DW-1 was sampled in 1992, 2017 and 2019 through 2024. TCE and c is-1,2-dichloroethene concentrations exceeded their respective MCLs in all seven sampling events , with TCE detected at up to 100 µg/L. The detections of 1,4-dioxane are below the response level of 35 µg/L.3 Langan also reviewed TCE concentration data for nearby supply wells available in the State Water Resources Control Board ’s Groundwater Ambient Monitoring and Assessment Program Groundwater Information System (GAMA-GIS). As shown on Figure 4, TCE impacts appear to be localized to the Site and possibly downgradient areas, though it is not yet known whether the offsite TCE detections are attributable to the Site. Inferred upgradient, offsite municipal water supply wells 4, 8S, and 11S were non-detect for TCE in 2006, 2020, and 2024, respectively.

Inferred cross-gradient, offsite municipal supply well 6S, located west of the Site, was non-detect for TCE based on various sampling events from 1985 through 2022. Inferred downgradient, offsite municipal supply well 7S, which is 4,000 feet south of the Site, was non-detect for TCE in 2012, after having detections of TCE in the early 2000s as high as 7.4 µg/L.

3.0 PROPOSED SCOPE OF WORK
The scope outlined in this Work Plan includes installing two offsite deep groundwater monitoring wells to approximately 250 to 270 feet bgs (Figure 4).

3.1 Mobilization

3.1.1 Survey, Permitting, and Health and Safety Plan
Prior to well installation, a survey will be performed of the proposed well locations to identify and define offset(s) from nearby roadways and infrastructure. Preliminary locations are depicted on Figure 4. The locations shown are approximate and may be adjusted such that 1) utilities are properly located and avoided, (2) the installation will not require tree removal or other major park disruptions, and (3) the locations are generally accessible for installation and monitoring.

3 California Notification and Response Levels. Available online at:
https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/14-Dioxane.html Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

Groundwater monitoring well installation permits will be obtained from the COSB Environmental Health Services (CSBEHS) prior to beginning drilling activities. DMW-6 is planned to be installed on COSB Parks Department (Parks Department) property. An encroachment permit is not anticipated to be required on Parks Department property based on discussions with Parks Department personnel. DMW-7 is planned to be installed on City property and Langan anticipates an encroachment permit will be required.

A Langan Site-specific Health and Safety Plan will be prepared to ensure safe working conditions during the field activities and will outline steps to minimize or prevent accidents and/or exposure to chemicals of concern. All onsite personnel will be required to review and adhere to the Health and Safety Plan.

3.1.2 Utility Clearance
At least two working days prior to mobilization, the proposed well locations will be clearly marked on the ground surface with water-based UV white paint and/or stakes. DigAlert will be contacted to identify and mark out underground utilities within 10 feet of the proposed locations. A private utility locating company will be contracted to scan for utilities in a 10 foot by 10 foot area around each well location. Additionally, the well locations will be cleared using soft-digging techniques to at least 5 feet bgs prior to drilling (this may require several hand -auger locations to cover

1.5 times the proposed well diameter or air-knifing).

3.2 Groundwater Well Installation, Development, and Sampling

3.2.1 Groundwater Well Installation
Two 9-inch diameter soil borings will be advanced to maximum depth of 270 feet bgs, using sonic drilling at the approximate locations shown on Figure 4. Precise well locations will be confirmed following local survey of the proposed well locations. The drilling will be performed by a California-licensed C-57 contractor and will be completed under the responsible oversight a California-licensed Professional Geologist or Engineer. Soil cores will be collected from the inner core barrel plastic sleeves that ar e located within the larger override casing. Soil from the soil cores will be field screened for VOCs using a photoionization detector (PID) and will be classified visually in accordance with the Unified Soil Classification System (USCS). The USCS descriptions and PID readings will be recorded on field logs for inclusion in the Offsite Deep Groundwater Investigation Report (see Section 5.0) . Soil sampling is not proposed given that the proposed wells are located approximately 700 feet and 1,375 feet from the Site.

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

A groundwater monitoring well will be installed in each boring (DMW -6 and DMW -7) with proposed depths of approximately 240 and 245 feet, respectively. The wells will be constructed with a 4-inch-diameter Schedule 80 polyvinyl chloride (PVC) casing with 0.020-inch machined slot screens from approximately 200 to 2 40 feet bgs and 205 to 245 feet bgs, respectively . The screens will be adjusted as necessary during well installation to position the top of screen approximately 10 feet above the estimated depth of the water table and provide a 40-foot screen length. The screen is intended to be placed fully within geologic Unit 4 (e.g., gravel). Proposed well construction details are listed in Table 1 and depicted on Figure 5.

The monitoring wells will be backfilled with # 3 sand from the bottom of the borehole annular space (i.e., approximate bottom of the screened interval) to approximately 2 feet above the well screen. The filter pack will be surged , sealed, and 5 feet of hydrated bentonite will be placed above the sand in the annular space. Bentonite-cement grout will be placed in the annular space from the hydrated bentonite layer to ground surface. Both wells will be completed with flush- mounted traffic-rated well boxes set in concrete. The concrete pad will be raised ap proximately 1 to 1.5 inches above ground surface to prevent burial and slightly sloped to prevent damage to vehicles and promote runoff. If the well is installed in a sidewalk or roadway, the wells will be constructed flush with the ground surface to minimize potential trip hazards. The well number (identification) will be etched into the concrete pad. The top of casing will be marked to indicate where depth to groundwater measurements will be measured. As-built well construction details along with boring l ogs will be presented in the Offsite Deep Groundwater Monitoring Well Installation Report (See Section 5.0).

3.2.2 Groundwater Well Development
The newly installed monitoring wells will be developed in accordance with procedures specified in the State of California Department of Water Resources Monitoring Well Standards (Bulletin 74- 90) (DWR, 1991). Between 2 and 7 days following well installations, a well development rig or drill rig will be used to surge the screened interval. A bailer will be used to remove solids introduced during the surging. The well will be purged using an electric submersible pump until water quality parameters (turbidity, pH, conductivity, and temperature) adequately stabilize. A value is considered to have stabilized when three consecutive readings taken at one -half well volume intervals are within 10% of each other (pH stabilization = 0.2 pH units). A minimum of one well volume will be removed during purging, or enough water to lower the water level to approximately one -half its original level, if well recharging allows. Data collected during development will be recorded on well -development logs and presented in the Offsite Deep Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

Groundwater Monitoring Well Installation Report.

3.2.3 Well Survey
The horizontal locations and vertical elevations of the newly installed groundwater monitoring wells will be surveyed by a State of California -licensed land surveyor in accordance with State Water Resources Control Board GeoTracker standards. The horizontal coordinates will be reported in latitude/longitude to seven decimal places with an accuracy of less than 0.1 meter using the 1983 North American Datum (NAD83). Relative elevations will be reported within an accuracy of 0.01 feet using 1988 North American Vertical Datum (NAVD88). The surveyor will mark the survey points of the wells on the tops of the casings and groundwater levels will be measured from these points.

3.2.4 Decontamination and Waste Management
Reusable sampling equipment will be decontaminated between sample intervals using the triple- wash method. Decontamination procedures include an initial wash with tap water mixed with non-phosphate detergent, followed by a rinse with tap water, and finished by a rinse with distilled water.

Soil cuttings, decontamination water, and purge water will be stored in DOT-approved 55-gallon drums, totes, or bins pending characterization for offsite disposal. Temporary storage of the investigation-derived waste (IDW) will be coordinated with the COSB, City, and/or the Site property owners. The IDW will be managed according to state and federal regulations by a licensed waste hauler and disposed at a licensed facility.

4.0 SAMPLING AND ANALYSIS PLAN/QUALITY ASSURANCE PROJECT PLAN Baseline groundwater sampling of shallow/perched zone wells and semi -annual groundwater sampling of deep water-bearing zone wells will be performed in accordance with this Sampling and Analysis Plan/Quality Assurance Project Plan (SAP/QAPP).

4.1 Sampling and Analysis Plan
A baseline groundwater monitoring event and eight semi-annual groundwater monitoring events will be performed over a four - (4) year period commencing upon completion of offsite deep monitoring well installation outlined above. During each monitoring event, the groundwater levels will be gauged at monitored wells. The baseline monitoring event will include sampling of onsite shallow/perched wells MW -1 through MW -16, if groundwater is present, and vertical profil e Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

sampling at municipal supply well 2AS. Semi-annual groundwater monitoring events will be limited to monitoring of offsite wells DMW-6, DMW-7 and MAFI-DW-1. Additionally, supply well 2AS will be included in the first semi-annual monitoring event of year three of the monitoring program.4 A sampling and analysis plan summarizing the baseline and semi-annual monitoring program is provided as Table 4.

4.1.1 Depth to Groundwater Measurements
Monitoring wells will be gauged using a water level indicator to the nearest 0.01 foot measured at the marked survey points and recorded on a field log.

4.1.2 Groundwater Sampling Methodology and Laboratory Analysis The shallow and deep monitoring wells will be purged and sampled using low-flow (minimal- drawdown) purging methods using a bladder pump or an electric submersible pump equipped with a flow -rate controller and dedicated tubing. A peristaltic pump may be used for shallow sample locations. Anticipated equipment will include a bladder pump or submersible positive - displacement pump with adjustable discharge rate, an electronic water level indicator, and a flow cell with water quality instruments that measure tem perature, electrical conductivity (EC), pH, dissolved oxygen (DO), oxidation -reduction potential (ORP), and turbidity. Groundwater will be discharged from the pump through polyethylene tubing into the flow cell to measure the groundwater quality parameters.

An electronic water level indicator will be used during sampling to measure depth to water or drawdown to inform the appropriate pumping rate. The target pumping rate will be 100 to 500 milliliters per minute; however, a sustainable low-flow pumping rate will be established such that head loss targets 0.3 feet or less of drawdown. The groundwater monitoring well will be purged until water quality parameter readings (pH, temperature and specific conductance) stabilize. Water quality parameters and volumes purged will be recorded on purge sheets every 3 to 5 minutes . If groundwater parameters haven’t stabilized after three well volumes, two additional well volumes shall be purged from the well, prior to sample collection. Monitoring well purging will be considered complete after five well volumes have been removed from the well.

4 If sampling of former municipal supply well 2AS is not possible, a suitable shallow well shall be sampled in the vicinity in consultation with Central Coast Water Board.

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

Parameter Stability Criteria
Temperature +/-0.5 ºC
pH +/-0.2
Specific Conductance +/-10%
Immediately following purging, the groundwater sample will be collected and placed in the appropriate laboratory- supplied sampling containers directly from the dedicated pump tubing.

The samples will be labeled with sample -point identification, project name, and analysis requested, and then placed on ice pending delivery to a California ELAP-certified laboratory under chain-of-custody protocol.

The groundwater samples will be analyzed for VOCs by USEPA Method 8260B and TPHg/d by USEPA Method 8015 -modified. Field duplicates and e quipment and t rip blank s will also be analyzed for VOCs using USEPA Method 8260B , as further described in Section 4.2.1 .

Additionally, one groundwater sample collected as part of the baseline monitoring event will be analyzed for the constituents outlined in the City industrial wastewater discharge permit. T he baseline monitoring event, the first semi-annual monitoring event of year one of the monitoring program, and the first semi-annual monitoring event of year three of the monitoring program (fifth semi-annual monitoring event) will also include 1,4-dioxane by EPA Method 8270 (all wells) and general minerals (deep wells only). General minerals will include analysis for sodium, potassium, calcium, magnesium, chloride, carbonate, bicarbonate, sulfate and nitrate under EPA Methods E300.1, SM2320B, SM4500, E200.8, SM2510B, and SM2540C.

4.1.3 Alternative Sampling Approach: Passive Sampling
Passive sampling (passive diffusion or HydraSleeve no-purge sampling) will be implemented at each deep monitoring well as an alternative to low flow sampling at the discretion of the Central Coast Water Board . A passive diffusion sampler consists of one or more semipermeable membranes former into a tubular shape, sealed at the bottom and filled with deionized water.

The sampler will be suspended in the screened interval at the desired sampling location and left in place for chemical equilibrium to occur. Due to the concentration gradient between the deionized water and the well formation groundwater, contaminants and other chemical constituents will flow into the sampler until equilibrium is reached. The time to equilibrium will depend on the manufacturer of the sampler and the recommendation for each chemical of concern, and typically is approximately 2 to 3 weeks. A HydraSleeve no-purge sampler collects a discrete water column sample into a sample sleeve. No -purge sampling will be performed in Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

accordance with the manufacturer’s standard operating procedure.5 A bottom weight is secured to the sampler to carry the sampler to the specified sampling depth.

4.1.4 Vertical Profiling at Municipal Supply Well 2AS
Vertical profiling of municipal supply well 2AS will be conducted during the baseline groundwater monitoring event. A video survey of the interior of the well will be conducted using an exploratory camera to confirm the screen ed interval is 182 to 238 feet bgs (as per the markup of the well construction log included in Appendix A ). Three low -flow, passive diffusion or no -flow groundwater samples will then be collected at 2AS. A sample will be collected at approximately 210 to 215 feet bgs (or at first encountered groundwater along the screened interval) to match the depth of TCE detected in MAFI-DW-1 in 2023 and one sample each at the middle and bottom of the saturated screened interval at 220 to 225 feet bgs and 230 to 235 feet bgs, respectively.

Sampling multiple depths along the well screen is intended to evaluate the vertical profile of potential contamination. If the measured groundwater level is deeper than anticipated (i.e., deeper than 210 feet bgs), then only two samples may be collected.

4.2 Quality Assurance Project Plan
Quality assurance/quality control (QA/QC) procedures will be used in both sample collection and chemical analysis. The purpose of the QA/QC procedures is to ensure the reliability and validity of data generated during the monitoring events described in this work plan. QC samples will be collected during field activities, including a groundwater field duplicate, an equipment blank, and a trip blank sample.

4.2.1 Field QA/QC Procedures
Field QA/QC procedures will be performed during the investigations and will consist of the following measures:
• Chain of custody (COC) records will be used to document sample collection and will be submitted to the laboratory performing the chemical analyses. A COC record will accompany all samples submitted for chemical analyses; and • Daily information regarding sample collection will be recorded in field logs , including sample type(s), description, sample identification number(s), and sample time(s).

5 HydraSleeve Standard Operating Procedure. Available online at:
https://eonpro.com/wp-content/uploads/2023/04/HydraSleeve-SOP-2.0-2023-1.pdf Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

Field QA/QC samples will be collected and submitted for chemical analyses along with the groundwater samples, and will include the following:
• Field Duplicate Sample: One duplicate groundwater sample will be collected and analyzed per sampling day to evaluate the analytical procedures and methods employed by the laboratory. The duplicate groundwater sample will be collected concurrently with its parent groundwater sample and will be submitted for VOCs analysis. • Equipment Blank Sample : One equipment blank sample will be collected per sampling day to determine the efficacy of decontamination procedures for sampling equipment and will be collected when disposable sampling equipment is not used. The equipment blank sample will consist of deionized water poured over or pumped through the decontaminated sampling equipment, and collection of the rinsate into the appropriate sample containers. The equipment blank sample will be submitted for VOCs analysis. • Trip Blank Sample: One trip blank sample will be submitted and analyzed per sampling day. The trip blank water sample will consist of a sample of deionized water provided by the laboratory and stored with the samples collected during each day of field activities.

The purpose of the trip blank sample is to evaluate the potential for cross -contamination of aqueous samples during handling. The trip blank sample(s) will be handled in the same manner as all other samples and submitted for VOCs analysis.

4.2.2 Laboratory QA/QC Procedures
Laboratory QA/QC procedures will include the following:
• Chemical analyses will be performed within the required holding time for all samples chemically analyzed.
• A state-certified hazardous waste testing laboratory will conduct the required analysis.

The laboratory will provide the following information for each sample:
• Method blank data;
• Surrogate recovery, instrument tuning, and calibration data; and • Signed laboratory reports including the sample designation, date of sample collection, date of sample analysis, laboratory analytical method employed, sample volume, and the minimum RL.

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

5.0 REPORTING
An Offsite Deep Groundwater Monitoring Well Installation Report will be prepared describing well construction and development, and deviations from this Work Plan (if any). The Well Installation Report will provide as-built well construction details , boring logs, well-development records, and copies of the DWR well completion reports.

Separate Baseline and Semi-annual Groundwater Monitoring Report s will be prepared for the baseline groundwater monitoring event and each subsequent semi-annual monitoring event. The Baseline and Semi-annual Groundwater Monitoring Reports will include the following elements for general consistency with the Order and for compliance with the Terms:

1. A table with well completion information, including top of well casing elevation, total depth, and screen interval with respect to both mean sea level and ground surface for all monitored wells.

2. Results of field and laboratory sampling in tabular form compared to drinking water MCLs. • If detections warrant, and in discussion with COSB and Central Coast Water Board, then the 5th semi-annual groundwater monitoring report may recommend further evaluation of the use of former municipal supply well 2AS for future hydraulic containment. The evaluation would include detailed recommendations for what work would need to be completed to have the well serve as a hydraulic containment well to prevent potential migration of contaminated groundwater beyond the Site boundaries in the future.

3. Scaled maps showing the Site and the locations of monitoring wells.

4. Maps showing calculated potentiometric groundwater elevations at each monitoring well and interpreted potentiometric surfaces for each water-bearing zone, as applicable to the monitoring event.

5. Maps showing VOCs and 1,4 -dioxane concentrations and an interpretation of the chemical distribution.

6. An evaluation and interpretation of available data.

7. The signature or stamp of a registered professional with applicable experience attesting, under penalty of perjury, that the report is true and accurate.

8. Sampling protocols and field sampling logs.

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

9. Narrative description of sample collection protocols and summary of analytical results for any and all detected compounds; and

10. Certified laboratory analytical reports and chain of custody records for current monitoring data.

The reports will be reviewed and approved by a licensed California Professional Geologist or Engineer. Groundwater analytical data and reports will be submitted to the Central Coast Water Board via upload to GeoTracker within 45 days of receipt of the laboratory data as an EQuIS electronic data deliverable (EQEDD).

6.0 IMPLEMENTATION SCHEDULE
Following approval of this Work Plan, the implementation schedule for well installation and sampling will follow the schedule outlined below:
• Baseline monitoring event and reporting for shallow/perched zone wells and former municipal supply well 2AS: within 90 - to 120 -days of the fully executed Settlement Agreement.
• Deep g roundwater monitoring well installation , development, survey , and reporting :
within 120 days of the fully executed Settlement Agreement. The schedule is based on necessary permits being obtained within 60 days of the fully executed Settlement Agreement. Well installation, development and survey require an estimated three weeks for field completion. Well completion reports will be submitted to DDW, the COSB, and the Central Coast Water Board 30 days following completion of well installation. • Semiannual groundwater sampling and reporting: Deep well semi-annual monitoring will be performed within October to March and April to September of each calendar year for eight total semi-annual monitoring events. Groundwater sampling is estimated to require up to three weeks, dependent upon sampling approach . Semi-annual reports will be submitted, on or by April 30 and October 31.

The listed schedule is subject to change based on timelines for this Work Plan, the Settlement Agreement, and permits required for well installation.

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

7.0 REFERENCES
Analytical Consulting Group, Inc. (ACG). 2021. Monitoring Well Investigation Report. Former Semco Twist Drill & Tool Company. 2936 Industrial Parkway. Santa Maria, California. Site I.D. No.

SLT3S2411351 (October 20, 2015 , California Water Code [Water Code] section 13267 Investigative Order [2015 Order]). July 16.

ACG. 2021. Site Assessment Workplan. Monitoring Well Evaluation. Soil Vapor Sampling. Indoor Air Sampling. Former Semco Twist Drill & Tool Company. 2936 Industrial Parkway. Santa Maria, California. Site I.D. No. SLT3S2411351 (October 20, 2015, California Water Code [Water Code] section 13267 Investigative Order [2015 Order]). February 12.

California Department of Water Resources (DWR). 1991. Monitoring Well Standards Bulletin 74-90. June 1991.

Central Coast Regional Water Quality Control Board (CCRWQCB). 2015. Letter entitled “Site Cleanup Program: SEMCO Twist Drill and Tool Company, Inc., 2936 Industrial Parkway, Santa Maria, Santa Barbara County (GeoTracker Global ID# SLT3S2411351) – Requirement for Site Investigation.” October 20.

CCRWQCB. 2023. Cleanup and Abatement Order No. R3-2023-0070. Former Semco Twist Drill and Tool Company, Inc. ET AL. Industrial Parkway, Santa Maria Santa Barbara County.

September 25.

CCRWQCB, State Water Resources Control Board (SWRCB), and California Environmental Protection Agency (CalEPA), 2019. Water Quality Control Plan for the Central Coastal Basin. June.

DWR. 2004. California Department of Water Resources Santa Maria River Valley Groundwater Basin. California’s Groundwater Bulletin No. 118. Last updated February 27, 2004.

Eon Products, Inc. Standard Operating Procedures for Groundwater Sampling Using Passive Diffusion Samplers.

Everest Services, Inc. (Everest), 2004. 2003 Third Quarter Report for Groundwater Monitoring Activities at 2936 Industrial Parkway APNs 111 -291-027 & 028. Santa Maria, California. Santa Barbara County, California. February 24.

Haro Environmental, 2024. Offsite Deep Groundwater Monitoring Investigation Work Plan, 2936 Industrial Parkway, Santa Maria, California 93455. Prepared for Rhine, L.P. March 25.

Padre Associates, Inc., 2024. Report of Findings, Annual 2024 Groundwater Monitoring Event, 3037 Industrial Parkway, Santa Maria, Santa Barbara County, California (Global ID No.

SLT3S0301290). December.

Tetra Tech, 1999. Technical Report on Groundwater Monitoring, SEMCO Twist Drill & Tool Company, 2936 Industrial Parkway, Santa Maria, California. March 22.

Attachment B
Offsite and Onsite Groundwater Characterization Work Plan 2936 Industrial Parkway
Santa Maria, California
Langan Project Number: 781016901
19 September 2025

Worts, G.F. 1951. Geology and Ground-Water Resources of the Santa Maria Valley Area, California. Geologic Survey Water-Supply Paper 1000. 1951. Available online:
https://pubs.usgs.gov/wsp/1000/report.pdf
Attachment B

TABLES

Attachment B
Table 1
Proposed Well Construction Details
SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
Well
Screen
(Top)
Well Screen
(Bottom)
(elev in ft amsl) (ft bgs) (in) (in)
DMW-6 252 240 4 193 198 0.020 200 240
DMW-7 253 245 4 198 203 0.020 205 245
Notes:
amsl - above mean sea level
bgs - below ground surface
elev - elevation
ft - feet
in - inches
Screen
Slot Size
Top of
Bentonite
Seal Depth
Estimated Surface
GradeWell ID
Anticipated Screened
Interval
Casing
Diameter
Total
Depth of
Well
Top of
Sand Pack
Depth
(ft bgs) (ft bgs)

Attachment B
Table 2
Historical Groundwater Elevations for Deep Water-Bearing Zone Monitoring Wells SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
Well Casing Elevation
(feet amsl)
Well depth (feet
bwc) Date measured Depth to Water (feet
bwc)1
Groundwater Elevation
(feet amsl)
Mar-91 186.64 51.10
Aug-94 191.89 45.85
Jun-95 183.55 54.19
Jun-96 175.10 62.64
Jan-97 166.55 71.19
Jun-97 166.55 71.19
Dec-97 158.84 78.90
Jul-98 141.96 95.78
Nov-98 142.06 95.68
Dec-98 141.30 96.44
Jul-99 132.99 104.75
Jan-00 126.81 110.93
Jul-00 127.44 110.30
Dec-00 126.98 110.76
Jun-21 Abandoned
Mar-91 185.62 50.81
Dec-98 139.91 96.52
Sep-03 139.22 99.48
Jun-21 Dry
Mar-91 185.20 50.99
Aug-94 191.33 44.86
Jun-95 183.10 53.09
Mar-91 185.20 50.99
Jun-96 174.72 61.47
Jan-97 166.20 69.99
Jun-97 166.27 69.92
Dec-97 158.57 77.62
Jul-98 146.75 89.44
Nov-98 141.85 94.34
Dec-98 139.67 96.52
Jul-99 131.31 104.88
Jan-00 125.20 110.99
Jul-00 125.82 110.37
Dec-00 125.38 110.81
Sep-03 139.00 99.43
Jun-21 Unable to locate
Mar-91 187.12 51.09
Dec-98 141.48 96.73
Sep-03 141.00 99.50
Jun-21 Dry
May-92 -- --
Mar-17 -- 44.9
Mar-19 193.64 40.25
Sep-19 196.54 37.35
May-20 192.28 41.61
Nov-20 197.74 36.15
Nov-21 202.44 31.45
Nov-22 207.97 25.92
Nov-23 206.94 26.95
Nov-24 190.7 43.19
Notes:
1Groundwater depths for DMW-1 through DMW-4 calculated based on casing top elevation reported as of September 2003. amsl - above mean sea level
bwc - below well casing
-- - not applicable / no data available
DMW 1
DMW 2
Historical onsite data from 2003 Third Quarter Report For Groundwater Monitoring Activities at 2936 Industrial Parkway, APNs 111-291-027 & 028, Santa Maria, California, dated February 24, 2004 by Everest Services, Inc.

MAFI-DW-
1 233.89
237.74 208
199
200
207
215
238.21
236.19
236.43
Historical offsite (MAFI-DW-1) data from Annual 2024 Groundwater Monitoring Event, Report of Findings, 3037 Industrial Parkway, Santa Maria, California, dated December 2024 by Padre Associates, Inc.

DMW 3
DMW 4

Attachment B
Table 3
Historical Groundwater Analytical Results for Deep Water-Bearing Zone Monitoring Wells SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
Semi-Volatile
Organic
Compounds
1,1,1-Trichloroethane
1,1,2-Trichloroethane
1,2-Dichloroethane
Cis-1,2-Dichloroethene
Dibromochloromethane
Tetrachloroethene (PCE)
Toluene
Trans-1,2-Dichloroethene
Trichloroethene (TCE)
Vinyl Chloride
1,4-Dioxane (P-Dioxane)
Petroleum Hydrocarbons
(C04-C12) GRO
Petroleum Hydrocarbons
(C13-C22) DRO
Petroleum Hydrocarbons
(C23-C40) ORO
Petroleum Hydrocarbons
(C14-C34)
71-55-6 79-00-5 107-06-2 156-59-2 124-48-1 127-18-4 108-88-3 156-60-5 79-01-6 75-01-4 123-91-1 PHCC4C12 PHCC13C22 PHCC23C40 PHCC14C34 200 5 0.5 6 801 5 150 10 5 0.5 0.381,2 NS NS NS NS
Sample Name Original Sample
Name Sample Date µg/l µg/l µg/l µg/l µg/l µg/l µg/l µg/l µg/l µg/l µg/l µg/l µg/l µg/l µg/l DMW-1_120390 DMW1-12-90 12/03/1990 ND U ND U ND U ND U ND U ND U ND U ND U ND U ND U NA NA NA NA NA DMW-1_122890 DMW1-2-90V 12/28/1990 ND U ND U ND U ND U ND U ND U 1.3 ND U ND U ND U NA NA NA NA NA DMW-1_121598 DMW-1 12/15/1998 ND U ND U NA ND U NA ND U ND U ND U ND U ND U NA NA NA NA NA DMW-2_120390 DMW2-12-90 12/03/1990 3.0 ND U ND U 1.2 0.26 ND U 1.3 ND U 13 ND U NA NA NA NA NA DMW-2_122890 DMW2-2-90V 12/28/1990 ND U ND U ND U 2.1 ND U ND U ND U ND U 24 ND U NA NA NA NA NA DMW-2_121498 DMW-2 12/14/1998 ND U ND U NA 1.3 NA ND U ND U ND U 45 ND U NA NA NA NA NA DMW-2_092203 GWDMW2-092203 09/22/2003 ND U 1.7 0.5 97 ND U ND U ND U ND U 1,200 ND U 5.0 NA NA NA ND U DMW-3_032291 DMW3-3-91 03/22/1991 ND U ND U ND U 1.4 ND U ND U ND U ND U 21 ND U NA NA NA NA NA DMW-3D_032291 DMW3-3-91D 03/22/1991 ND U ND U ND U 1.4 ND U ND U ND U ND U 22 ND U NA NA NA NA NA DMW-3_121598 DMW-3 12/15/1998 ND U ND U NA ND U NA ND U ND U ND U 1.6 ND U NA NA NA NA NA DMW-3_092203 GWDMW3-092203 09/22/2003 ND U ND U ND U ND U ND U ND U ND U ND U 6.7 ND U ND U NA NA NA ND U DMW-4_032291 DMW4-3-91 03/22/1991 ND U ND U ND U ND U ND U ND U 6.5 ND U ND U ND U NA NA NA NA NA DMW-4_121598 DMW-4 12/15/1998 ND U ND U NA ND U NA ND U ND U ND U 1.4 ND U NA NA NA NA NA DMW-4_092203 GWDMW4-092203 09/22/2003 ND U ND U ND U ND U ND U ND U ND U ND U ND U ND U ND U NA NA NA 230 B166 B166 5/21/1985 5.0 NA 0.1 U NA 0.1 U 0.1 U 0.1 U 1 U 0.1 U 0.1 U NA NA NA NA NA B1667 B1667 5/30/1985 1.0 NA 1.0 U NA 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U NA NA NA NA NA B1668 B1668 5/30/1985 1.0 U NA 1.0 U NA 1.0 U 1.0 U 1.0 U 1.0 U 59 1.0 U NA NA NA NA NA MAFI-DW-1_050592 DW-1 5/5/1992 NA NA 0.5 U 0.5 U NA 0.5 U NA 0.5 U 7.5 0.5 U NA NA NA NA NA MAFI-DW-1_031517 DW-1 3/15/2017 NA NA 1 U 10.9 NA 1 U NA 1 U 60.1 3 U NA NA NA NA NA MAFI-DW-1_031519 DW-1 3/15/2019 NA NA 0.5 U 9 NA 0.5 U NA 0.5 U 45 0.5 U 1.0 U NA NA NA NA MAFI-DW-1_092419 DW-1 9/24/2019 NA NA 5.0 U 10 NA 5.0 U NA 5.0 U 56 5.0 U 1.1 U NA NA NA NA MAFI-DW-1_050720 DW-1 5/7/2020 NA NA 5 U 8.4 NA 5 U NA 5 U 79 5 U 1.2 U NA NA NA NA MAFI-DW-1_111020 DW-1 11/10/2020 NA NA 5 U 9.4 NA 5 U NA 5 U 65 5 U 1.2 U NA NA NA NA MAFI-DW-1_113021 DW-1 11/30/2021 NA NA 5 U 18 NA 5 U NA 5 U 63 5 U 0.59 J NA NA NA NA MAFI-DW-1_112822 DW-1 11/28/2022 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA MAFI-DW-1_112823 DW-1 11/28/2023 NA NA 5.0 U 11 NA 5.0 U NA 5.0 U 100 5.0 U 0.65 J NA NA NA NA MAFI-DW-1_111824 DW-1 11/18/2024 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA MAFI-DW-1
Location
DMW-1
DMW-2
DMW-3
DMW-4
2AS
Off-site Onsite
Analyte3
Volatile Organic Compounds Petroleum Hydrocarbons
CAS Number
Drinking Water MCLs

Attachment B
Table 3
Historical Groundwater Analytical Results for Deep Water-Bearing Zone Monitoring Wells SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
Notes:

Groundwater results were compared to California Title 2022 Drinking Water MCLs (November 2024) 1Groundwater results were compared to San Francisco Bay RWQCB Groundwater Direct Exposure ESLs - MCL Priority (July 2019) 2 The State Water Resources Control Board (SWRCB) has adopted a drinking water notification level (NL) of 1 µg/l.

CAS - Chemical Abstract Service
ESL - Environmental Screening Level
MCL - State Maximum Contaminant Level
NA - Not Analyzed or Not Available (Historical Data)
ND - Not detected
NS - No standard
RWQCB - Regional Water Quality Control Board
µg/l - micrograms per liter
Qualifiers:

J - Estimated concentration. Compound detected above the method detection limit and below the reporting limit.

U - The analyte was analyzed for, but was not detected at a level greater than or equal to the RL; the value shown in the table is the RL.

Exceedance Summary:
- Result exceeds Groundwater Direct Exposure ESL - MCL Priority 3 Groundwater analytical data is cited from the 1999 Tetra Tech report, Technical Report on Groundwater Monitoring, SEMCO Twist Drill & Tool Company, and the 2003 Everest Services, Inc. report, 2003 Third Quarter Report For Groundwater Monitoring Activities. 10

Attachment B
Table 4
Sampling and Analysis Plan
SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
Baseline
First Semiannual:

October-March 2025-
2026
Second Semiannual:

April-September 2026
Third Semiannual:

October-March 2026-
2027
Fourth Semiannual:

April-September 2027
Fifth Semiannual:

October-March 2027-
2028
Sixth Semiannual: April-
September 2028
Seventh Semiannual:

October-March 2028-
2029
Eighth Semiannual:

April-September 2029
MW-1 to
MW-16
VOCs by USEPA Method
8260B
TPHg/d by USEPA
Method 8015-modified
1,4-Dioxane by USEPA
Method 8270
Gauge Depth-to-
Groundwater
Industrial Waste Water
Discharge Criteria (one
well/sample only)3
-- -- -- -- -- -- -- --
DMW-6.

DMW-7, and
MAFI-DW-1
--
VOCs by USEPA Method
8260B
TPHg/d by USEPA
Method 8015-modified
1,4-Dioxane by USEPA
Method 8270
General minerals1

Gauge Depth-to-
Groundwater
VOCs by USEPA Method
8260B
TPHg/d by USEPA
Method 8015-modified
Gauge Depth-to-
Groundwater
VOCs by USEPA Method
8260B
TPHg/d by USEPA
Method 8015-modified
Gauge Depth-to-
Groundwater
VOCs by USEPA Method
8260B
TPHg/d by USEPA
Method 8015-modified
Gauge Depth-to-
Groundwater
VOCs by USEPA Method
8260B
TPHg/d by USEPA
Method 8015-modified
1,4-Dioxane by USEPA
Method 8270
General minerals1

Gauge Depth-to-
Groundwater
VOCs by USEPA Method
8260B
TPHg/d by USEPA
Method 8015-modified
Gauge Depth-to-
Groundwater
VOCs by USEPA Method
8260B
TPHg/d by USEPA
Method 8015-modified
Gauge Depth-to-
Groundwater
VOCs by USEPA Method
8260B
TPHg/d by USEPA
Method 8015-modified
Gauge Depth-to-
Groundwater
2AS
Vertical Profiling for:

VOCs by USEPA Method
8260B
TPHg/d by USEPA
Method 8015-modified
1,4-Dioxane by USEPA
Method 8270
General minerals (single
sample depth only)1

Gauge Depth-to-
Groundwater
-- -- -- --
VOCs by USEPA Method
8260B
TPHg/d by USEPA
Method 8015-modified
1,4-Dioxane by USEPA
Method 8270
General minerals1

Gauge Depth-to-
Groundwater
-- -- --
Notes:

1. General minerals will include analysis for sodium, potassium, calcium, magnesium, chloride, carbonate, bicarbonate, sulfate and nitrate under USEPA Methods E300.1, SM2320B, SM4500, E200.8, SM2510B, and SM2540C.

2. One sample duplicate, equipment blank, and trip blank will be collected per field day and will be analyzed for VOCs using USEPA Method 8260B.

TPHg/d - total petroleum hydrocarbons as gasoline and diesel USEPA - United States Environmental Protection Agency
VOCs - volatile organic compounds
-- - not applicable
Well
Sampling Events2

3. Industrial waste water discharge criteria in accordance with City of Santa Maria industrial wastewater discharge permit requirements: arsenic, boron, cadmium, total chromium, copper, lead, mercury, nickel, silver, sodium, zinc, and total metals by USEPA Method 6020/200.8; cyanide by SM 4500-CN; hexavalent chromium by USEPA Method 7199; carbon and nitrogen (total nitrogen) by USEPA Method 415.3M; total phenols by USEPA Method 625.1; total identifiable chlorinated hydrocarbons by USEPA Method 624.1; pentachlorophenol by USEPA Method 4010A or 8270; biochemical oxygen demand by USEPA Method SM5210B; chemical oxygen demand by USEPA Method SM5220D; total suspended solids by USEPA Method SM2540D; total dissolved solids by USEPA Method SM2540C; total oil and grease by USEPA Method 1664A; chlorine by USEPA Method SM4500; and pH by USEPA Method 9040C.. Sample will be collected from MW-10 if adequate water is present for sampling.

Attachment B

FIGURES

Attachment B
SEMCO
Attachment B
SEMCO
Attachment B
SEMCO
Attachment B
Path: \\langan.com\data\SBA\data9\781016901\Project Data\ArcGIS\APRX\781016901.aprx © 2025 Langan
Project Figure Title Project No.

Date
Scale
Drawn By
Figure
Langan CA, Inc.
1" = 900'
AC
9/18/2025
781016901

CALIFORNIASANTA BARBARA COUNTY

SANTA MARIA

PROJECT
104 W Anapamu Street, Suite 204B
Santa Barbara, CA 93101
T: 805.957.6000 F: 805.957.6001 www.langan.com
!@?
ED
ED
ED ED
ED
ED
DMW-6
DMW-7
DMW-4
GW Elevation = NA
TCE non detect in 2022
GW Elevation = 43 feet AMSL in 2024
TCE = 100 µg/L in 2023
GW Elevation = 52 feet AMSL in 2017
TCE = NA
WELL 11S
CA4210011_011_011
WELL 8S
CA4210011_008_008
WELL 4
CA4200961_004_004
WELL 6S
CA4210011_006_006
WELL 2AS
CA4210011_001_001
MAFI: DW-1
EVERGREEN 02
CA4210016_003_003
10N34W34G002S
WELL 7S
CA4210011_007_007
09N34W03A002S
GW Elevation = NA
TCE non detect in 2024
GW Elevation = NA
TCE non detect in 1996
GW Elevation = NA
TCE = 59 µg/L in 1985
GW Elevation = 22 feet AMSL in 2023
TCE non detect in 2012,
as high as 7.4 µg/L in 2000 GW Elevation = NA
TCE = NA
GW Elevation = NA
TCE non detect in 2020
GW Elevation = Dry at 31 feet AMSL in 2021
TCE non detect in 2003
DMW-2
GW Elevation = Dry at 37 feet AMSL in 2021
TCE = 1,200 µg/L in 2003
DMW-1
GW Elevation = NA/Abandoned in 2021
TCE non detect in 1998
DMW-3
GW Elevation = NA/Not Located in 2021
TCE = 6.7 µg/L in 2003
GW Elevation = NA
TCE non detect in 2006
SEMCO
.
900 0 900

SCALE IN FEET
Legend
!@? MAFI: Deep Monitoring Well DW-1
EDProposed Deep Monitoring Well
EDDeep Monitoring Well
Water Supply Well
Inferred Groundwater Flow Direction
Approximate Site Boundary
Notes:

1. Aerial imagery provided by Esri.

2. All features shown are approximate.

3. TCE = trichloroethene in micrograms per liter (µg/L)

4. GW = Groundwater

5. NA = TCE data and/or elevation data not available.

6. AMSL = Above Mean Sea Level

7. Supply Well information obtained from Groundwater
Ambient Monitoring and Assessment Program Groundwater
Information System (GAMA GIS; June 2025) and Deep
Groundwater Well Location Map by West Environmental
Services & Technology (April 2025)
4 PROPOSED OFFSITE DEEP

WATER-BEARING ZONE

MONITORING WELL

LOCATIONS
SEMCO
Attachment B
9-inch borehole
Bottom of boring
Bottom of screen at 250 feet bgs
4 inch diameter well screen: Sch 80
PVC flush threaded, 0.020-inch slots
#3 filter sand pack
5 feet Bentonite chip or pellets
seal, hydrated
Ground surfaceCover
Cement-bentonite grout (less than
2% bentonite)
4 inch Sch 80 PVC well casing
240 feet bgs
200 feet bgs
2 feet
Interval Depth
193 feet bgs
2 feet
5 feet 5 feet
Concrete (for well box)
9-inch borehole
Bottom of boring
Bottom of screen at 270 feet bgs
4 inch diameter well screen: Sch 80
PVC flush threaded, 0.020-inch slots
#3 filter sand pack
5 feet Bentonite chip or pellets
seal, hydrated
Ground surfaceCover
Cement-bentonite grout (less than
2% bentonite)
4 inch Sch 80 PVC well casing
245 feet bgs
203 feet bgs
2 feet
Interval Depth
198 feet bgs
2 feet
5 feet 5 feet
Concrete (for well box)
40 feet
40 feet
205 feet bgs
198 feet bgs
Place centrilizers on maximum 40-ft
spacing
Place centrilizers on maximum 40-ft
spacing
Drawing Title
Figure No.

Project No.

Date
Figure 5

MONITORING WELL

CONSTRUCTION

DIAGRAMS
781016901
6/13/2025

ABU DHABI ATHENS DOHA DUBAI LONDON PANAMA

NEW JERSEY NEW YORK CONNECTICUT PENNSYLVANIA WASHINGTON, DC VIRGINIA

WEST VIRGINIA OHIO FLORIDA TEXAS ARIZONA CALIFORNIA 135 MAIN STREET, SUITE 1500, SAN FRANCISCO, CA 94105
T:415 955 5200 F:415 955 5201 www.langan.com
Filename: \\langan.com\data\SBA\data9\781016901\Project Data\CAD_01\Environmental\781016901-N-SP0103_2025.dwg Date: 9/22/2025 Time: 10:51 User: agekas Style Table: Langan.ctb Layout: Well Construction Diagrams Date
Issuances
Description
Date
Revisions
Description
9/19/2025
Attachment B

APPENDIX A

WELL COMPLETION REPORTS AND BORING LOGS

Attachment B
Table A1
Existing Well Construction Details for Deep Water-Bearing Zone SEMCO
Santa Maria, California
Langan Project: 781016901
September 2025
2003 2021
Well
Completion
Log (1988 -
1991)
DMW-1 DMW-1 Abandoned NA 208 188 - 208 4 inches 237.74 237.9 Flush mount with traffic box
DMW-2 DMW-2 Sampled Located, well plug intact,
dry but moist at the bottom 199 179 - 199 4 inches 236.43 236.4 Flush mount with traffic box
DMW-3 DMW-3 Sampled Not located 200 180 - 200 4 inches 236.19 236.38 Flush mount with traffic box
DMW-4 DMW-4 Sampled Located, dry 207 187 - 207 4 inches 238.21 238.44 Flush mount with traffic box
DMW-51 -- Dry Located, dry but moist at
the bottom 200.631 -- 4 inches -- -- --
2AS 2AS -- -- 247 182 - 238 -- -- -- --
MAFI-DW-1 DW-1 NA Sampled 215 175 - 215 4 inches 233.89 -- -- Notes:
1 Well location found during 2021 investigation and not previously noted on other maps or reports. Noted as "DMW5?" for the purpose of the 2021 investigation. 2 Well Head Elevation is presumed to be Top of Casing Elevation bgs - below ground surface
msl - mean sea level
NA - not applicable
Information gathered from the 2003 Everest Services, Inc. report, 2003 Third Quarter Report For Groundwater Monitoring Activities, the 2021 Analytical Consulting Group, Inc. report, Monitoring Well Investigation Report, Former Semco Twist Drill & Tool Company, and Well Completion Logs provided in Appendix A Surface cover
Well Head
Elevation2 (at
installation)
(feet above msl)
Ground Surface
Elevation (at
installation) (feet
above msl)
Well Status
Well Depth
(feet bgs)
Well Name
Screen
Interval (feet
bgs)
Well
diameterBoring

Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
t
�E RCE WELL COMPLE TION RECORD
JOB NO. ·:, O'l. 73 .0 0' WELL No. l>M W3 HYDROGEOLOGIST CE b awd .sl- b cuE NT .SE/ '1 to DRIL LER La.-3>1 <- ·E11J vr�'t.211mexki wELL LocAT10N 2..q 3, :r:�"--sil·;et..,.( ·pk_:J DATE/TIME s/e/c,1 @o ei/ D

GROUND SURFACE

DETAILS OF CONSTRUCTION
Date Comple ted 3 - 9 -q /
Borehole Dia meter (in.) IC) -J&i\
Type and Size of Casing (in.) 4-1� LC. S 1"
Type and Size of Screen (in.) 'I '"'IM � S, 'ii
Screen Perf oration Dia meter (in.) o.c,·-l.D �,"'
Screen Length (ft.) 2. 0, 0 � f
Cen tralizer Depths (ft.) .NJi.�.�.-=._.

Completion Technique:
1) Type of Filter Pack and Placement
Method
Lhl, t!, I-a. v: :tt-3 / TtYrVL ,'-£. l 2 -r e of Bentonite ana P od '� _;_--=-�=-1---!.---=�UJ.'4-�� '�
Method
,Mel� � + IT.-�ie. p.s:,1.s
Descrip tio�f Potential f4;,;ems With Well:

IJ_,::,/e-, '
� i.. c. "51 = Lt::JW Ca-... l, .. 'V\, � 4-t!� (
4,t., 6S = Sfain /44,, .sl,:-ef
Devel opm ent Technique
.s:"' bM.e""� ; ht:< 'Pu.1114 ·
GROUT

BENTON ITE

FILTER PACK
Well Head Elevation ___ _
Ground Su rface Elev. _____ _
Well Head Completion Method
"Tra� C. aux -. f/u.,i Jl'ttf.ul, 1-
Drillin g Met hod/Rig Type
( 1::,ua,,I Tu,h.e._ /1:>M l .�.j,ifr:'M S
Su rface Casing: Type )//1.

Diameter __ _
Length __ _

MATERIAL S
Cemen t (sks .) ?> :sic �
Filter Pack Material (tt.3 ) 'l sk,s
Casing Material (ft.) '2.l!JO--f! f
Bentonite (ft� ) 3 AiLc!.k 'f?f::.

I h 7. 0 Top of Ben tonite Seat J '{, 7. Ott.
j? 3, 6 T / 7 2 I · op of Filter Pack �. t:) ft .
. Top of Screen /�rO ft.

Bottom of Screen 1.,o&.Ott . .
-Bottom of Hole 2� 1, 0 f t.

NOTE: ALL DEPTHS AREREFERENCED TO GROUND SURFACE
Attachment B
--
I ,
�E RCE
'BORING NUMBER
b MW 3

FJELD LOG OF BORING
SHEET ' OF b - --

PROJECT NAME PROJECT NUMBER
I
!3.EVATJON AND DAllJM
I

LOCATION
_S E)i tD ·i O '2. 7 ''3 • 0 0. t 2-C/ �' :XNiu.t,,fMd.,( p�"

ORILUNG COMPANY DATE AND TIME STARTED
l.a14 n.� t,,,, ,;,' �IJV'l �e'H. -k(
DRILLER f'€ s \I' � 3-7 -'II Q 11 30
DRILJ.Joo E\UIPMENT
't::> -n l �..t.; +�rK.-s

SIZE AND TYPE OP'BIT
I o-ik. C 'r8U v.L ._ IV\

DRILLING FLUID
N�-e

SAMPLE HAMMER
TYPE n"+uma.�"
>-
8 en a:
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< w u, a:
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bw..e.. ( Wa.. L
COMPLETI ON oei+
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'-/ s; + "'- IV\ SAMPLES
-
DRILLING ANGLE ,s WA'TER FIRST
LEVEL
1 L/eJ-/k

I HYDROGEOLOGIST/ DATE
DRIVING WT. DROP 3t::)-� � CE't>I 6L. b

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SHEET i../ OF�

COMMENTS

1.; -:,,, f Ii {) C { �'1,; "
... . .. . ·-· ··· ·---·
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Attachment B
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and Energy
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'BORING NUMBER D M 'W -s
>- >-
§ m
DEPTH ... 8 0 �
§
{FEET)
<B !
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15'/
IS/;,
158
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188
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FIELD LOG OF BO RING (CONT INUE D)
== !z 9�
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m 8
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COMMENTS
.

Attachment B
i.
1 · ·,
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�E RC
� Environmental
and Energy
Services Co.

IBORING NUMBER D ,"-I w 3
> re § ;
w
DEPTH
I
(FEET)
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FIELP LOG OF BOR ING _(CONTINUED)
==� g::::, m 8

DESCRIPTION
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COMMENTS
Attachment B
�E RCE WELL COMPL ETION REC ORD
JOB NO. ':>0 173 & 00 i
cuENT :s/E Me o
WELL NO. J>jv) W '/HYDROGEOLOGIST f!e O av;uf �i..., b
WELL LOCATION 2'13-b �U5 fuaf 1"?/rJ

GROUND SURFACE

DETAILS OF CONSTRUCTION
Date Comple ted ---''3=---_'l ___ -_q_l ___ _
Borehole Diame ter (in.) l 0-, �
Type and Size of Casing (in .) '-1 ... ,� . LC S
A
Type and Size of Screen (in.) Lf- i� 6� "1
Screen Perf oration Diame ter (in.) D.o'lO -J v..

Screen Length (ft.) 1. o,c-#�
Centralizer Depths (ft.) AlA.._,_:_,-=-.--=-•
Completio n Tech nique :
1) Type of Filter Pack and Placement
Method
L 0'\C:'> 1-a \- :il:3 f trt!M, .. :f
2) Type of Benton ite�nd Placement Method
i/'t-i\.\ \Jo iela. T&t.� l--e ·
3) Type of Grout Mixture an
Method
V cl e\aj 6!'.RY-± } T .-,:,,.,,; � {7-!. 4:J,;)
Description of Potentiat'Pr oblems With Well:

Ne+-4
� -Le..,... _ _ :S_= __
�
-=--
. _"-'_Ca_v-....,..�-,:w,-6-+-c:_r:_I_ re � � :S = � 4-a,�I� :, t-t:-e l Develo pmen t Technique
..s '" b ""t:v:12·, b 1-e P le m. f .

DRIL LER L a.j n <: Lmti r-,,,,m ev,, Jd
DATE/TIME 3f e;/ ct1 @ oq 15 ·
, i
,, ,: 1
I
'
= i' 78,S
= 18 5".0
= ifJ'l .. O
Well Head Elevation ___ _
Ground Su rface Elev .. ___ _
Well Head Completion Method
7raB'ic 130,(
Drilling Met hod/Rig Type
Diameter __ _
Length __ _

MATERIALS
�eFAent (sks.) 3 5k"':,
Filter Pack Material (ft.3 ) 'l S /c S
Casing Material (ft.) ·J... I 0
Bentonite (ft� ) ·41 ba ckcb
Top of Ben tonite Sear i/8.,.:S' ft.

Top of Filter Pack iSS. 0 ft.

Top of Screen i 8 h O .f t.

GROUT

BENTON ITE

FILTER PACK
;;.:�:r.i?�l��i:, Bottom of Screen J..C 7. t:> ft.

Bottom of Hole 1.�et� ., · ft.

NOTE: ALL DEPTHS ARE REFERENCED TO GROUND SURFACE
:. ,· · .
'•
Attachment B
r 1 '� ERCE
!
I
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I
BORING NUMBER .t> 1'1 'W j

PROJECT NAME

FIELD LOG OF BOR ING
SHEET _J OF ---12._

PROJECT NUMBER
Sc,A,f t: D ·:; 0 2. 7 3 , C o J I

ELEV A TION AND DATUM
I

LOCATION
i.q ··; � I,�u;h"t �( ·pk�
/ I

DRILLING COMPANY
�Lij t1.<: e,;1 ,l;l/'"b,'\ i"ett. Ja.(
DRILLER + ·
!> -ev ,e_
DATE �D TIME
rAR_TED
•·3 ·- B ·-q I J 300

DATE AND TIME
;°
MPLfilED_ ·3 ,.q ·-9 ( o'J • o
DRIU� E\UIPMENT
·t;>...; l �"'� +�..--,i.�-s
SIZE AND TYPE OF"BIT
10 -i"" C V'c>c.J �,.,.L � I�

DRILLING FLUID
NM,e

SAMPLE HAMMER
TYPE /ti.(.. �:J.i_·t,
>
§
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DEPTH ..I
iS 0 Q.
e (FEET) :::::e (J
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HOLE DIAMETER BULK ss DRIVE NO. OF
lprr�
5; + IC)- ,� SAMPLES - � -·
DRILLING ANGLE ¢
,
WATER
LEVEL
FIRST
' ( � �,
AFTER _!.:L_HOURS
IS· � '"' 1&7 +i

HYOROGEOLOGIST/ DATE CHECKED BY/ DATE
DRIVING WT. ' --ltJ-1 b DROP �30 ·-� h C El;:,) �I-. b j . 3�q� ( == !z g::, m 8

DES CRIP TION
.S � ,i"' , 'M. -ftlt'.,t.M. - � c..Ca� -,1.'etl� e,�
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cn a PERCENT OF
CO MMENTS � ID
::,� en GR SA Fl
..
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CL
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Attachment B
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� ERC
� Environmental
and Energy
Services Co.

I
BORING NUMBER 't:> M w "
►
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DEPTH -'
8 0
(FEET) ::: < w -' 0 a:

32. 3 :.J
3�
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m 8

FIELD LOG OF BOR ING (CO NTI NU ED)

DESCRIPTION

ESTIMATED
u, o PERCENT OF
fA m
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u, GR SA Fl
SHEET ·Z, OF�

COMMEN TS
·- ··· -----
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and Energy
Services Co.

IBORING NUMBER 'bM hi Jj
► ►
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FIELD LOG OF BO RING {CON TINU ED)

DESC RIPTION
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Attachment B
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and Energy
Services Co.

I
BORING NUMBER 'C) ./YI \v �
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FIELD LOG OF BO RING _(CONT INUE D)

DESC RIPTION
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Attachment B
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BORING NUMBER O j� ·w lf . ,
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DESCRIPTION
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HISTORICAL GEOLOGIC CROSS SECTIONS
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GOLF COURSE

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FI GURE
----------------,-------------------------- �
Attachment B

WORK PLAN FOR ONSITE SOIL VAPOR EXTRACTION

for

2936 Industrial Parkway, Santa Maria
Santa Barbara County, California

Prepared For:

County of Santa Barbara
City of Santa Maria
Santa Maria Public Airport District

Prepared By:

Langan CA, Inc.
104 West Anapamu Street, Suite 204B
Santa Barbara, California 93101

Dorinda Shipman, PG CHG
Principal

Cory Lavoie, CHMM, PMP
Principal

Christina Rain, PE
Senior Project Manager

22 September 2025
781016901

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901
Page i

TABLE OF CONTENTS

1.0 INTRODUCTION ................................ ................................ ................................ ............. 1

1.1 SVE Remedial Goals and Data Quality Objectives ................................ .......... 1

1.2 Work Plan Organization ................................ ................................ .................... 2

2.0 BACKGROUND ................................ ................................ ................................ .............. 3

2.1 Site Description and History ................................ ................................ ............. 3

2.2 Site Geology ................................ ................................ ................................ ....... 3

2.3 Site Hydrogeology ................................ ................................ ............................. 4

2.4 Prior Site Investigations and Remediation ................................ ....................... 5

2.5 Recent Sampling Results ................................ ................................ .................. 5

2.5.1 Soil ................................ ................................ ................................ .......... 5

2.5.2 Soil Vapor ................................ ................................ ............................... 6

2.5.3 Indoor Air ................................ ................................ ................................ 6

3.0 SVE DESIGN BASIS AND CONSTRUCTION METHODOLOGY ................................ .... 6

3.1 SVE Design ................................ ................................ ................................ ......... 6

3.1.1 Pore Volume Exchange Assessment ................................ .................... 7

3.1.2 SVE Radius of Capture ................................ ................................ ........... 7

3.1.3 SVE Layout ................................ ................................ ............................. 9

3.2 Pre-Implementation Activities ................................ ................................ .......... 9

3.2.1 Site-Specific Health and Safety Plan ................................ ..................... 9

3.2.2 Access and Permitting ................................ ................................ ......... 10

3.2.3 Survey and Utility Clearance ................................ ............................... 10

3.2.4 Agency Notification ................................ ................................ .............. 10

3.3 Well Construction Methodology ................................ ................................ ..... 10

3.3.1 SVE Well Construction ................................ ................................ ......... 10

3.3.2 Well Box Installation at Existing Soil Vapor Monitoring Probes ...... 11

3.4 SVE System Equipment ................................ ................................ .................. 12

3.4.1 Vapor Extraction and Treatment Equipment ................................ ..... 12

3.5 Air Emissions Controls ................................ ................................ .................... 13

3.6 Contingencies ................................ ................................ ................................ .. 13

3.6.1 Groundwater ................................ ................................ ........................ 13

3.6.2 Potential Short Circuiting ................................ ................................ .... 14

3.6.3 Location and Elevation Survey ................................ ............................ 14

3.6.4 Site Power Supply Evaluation ................................ ............................. 15

3.7 System Telemetry Requirements ................................ ................................ ... 15

3.8 Waste Management ................................ ................................ ........................ 15

4.0 SVE OPERATION, MAINTENANCE AND MONITORING ................................ ............ 15

4.1 SVE Startup Testing ................................ ................................ ........................ 15

4.1.1 Startup Phase Groundwater Levels ................................ .................... 16

4.1.2 Sampling ................................ ................................ ............................... 16

4.1.3 Construction Completion Report ................................ ........................ 17

4.2 Performance Monitoring ................................ ................................ ................. 17

4.3 Remedial Goals, SVE Discontinuation, and Contingency VMS .................... 18 Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901
Page ii

TABLE OF CONTENTS
(Continued)

5.0 QUALITY ASSURANCE/ QUALITY CONTROL ................................ ........................... 19

5.1 Field QA / QC Procedures ................................ ................................ ................ 19

5.2 Laboratory QA / QC Procedures ................................ ................................ ..... 20

6.0 REFERENCES ................................ ................................ ................................ ............... 21

TABLES

FIGURES

781016901.03 Work Plan for Onsite Soil Vapor Extraction Report_2936 Industrial Parkway Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901
Page iii

ATTACHMENTS
TABLES
Table 1 Onsite Well Construction Summary
Table 2 Historical Groundwater Elevation Data (Shallow/Perched Zone) Table 3 Proposed SVE Well Construction Details
Table 4 Preliminary Estimated VOC Emissions

FIGURES
Figure 1 Site Location Map
Figure 2 Site Plan
Figure 3 Shallow/Perched Groundwater VOCs and 1,4-Dioxane Concentrations Map
Figure 4 Soil Sampling Locations Map
Figure 5 Soil Vapor TCE Concentrations Contour Map
Figure 6 SVE Schematic Layout
Figure 7 Soil Vapor Extraction Well Construction and Wellhead Diagram

APPENDICES
Appendix A Available Well Completion Logs and Boring Logs Appendix B Historical Subsurface Profiles (by Others)
Appendix C Historical Groundwater, Soil, Soil Vapor, and Indoor Air Data Table C1. Historical Groundwater Analytical Data (Shallow/Perched Zone) Table C2. Historical Soil Analytical Data
Table C3. Historical Soil Gas Analytical Data
Table C4. Historical Indoor Air Data
Appendix D Permit Application Forms
Appendix E Contingency Retrofit Vapor Mitigation System Basis of Design Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

WORK PLAN FOR ONSITE SOIL VAPOR EXTRACTION
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California

1.0 INTRODUCTION
On behalf of the County of Santa Barbara (County), the City of Santa Maria, and the Santa Maria Public Airport District (Agencies), Langan CA, Inc. (Langan) has prepared this Work Plan for Onsite Soil Vapor Extraction (SVE) at the former SEMCO Twist Drill and Tool Company, Inc., (SEMCO) Site located at 2926, 2936, 2946, 2956, 2976, and 2986 Industrial Parkway, Santa Maria, Santa Barbara County, California (the “Site”) (Figure 1).

The Central Coast Regional Water Quality Control Board (CCRWQCB) has identified the Site as CCRWQCB Case No. S28 (SLT3S2411351).

This Work Plan provides the proposed scope of work for onsite SVE as outlined in the terms of Settlement Work contained in the Settlement Agreement between the CCRWQCB and the Agencies (Settlement Agreement). The SEMCO Site is currently also subject to the CCRWQCB Order No. R3-2023-0070 (Order) for the investigation and cleanup or abatement of volatile organic compounds (VOCs), petroleum hydrocarbons, and 1,4-dioxane reportedly discharged at the Site.

1.1 SVE Remedial Goals and Data Quality Objectives
The Site has elevated concentrations of VOCs, petroleum hydrocarbons and 1,4-dioxane in the subsurface.

The Site contaminants of concern (COCs), as defined by the CCRWQCB in Order No. R3-2023-0070, are listed below:
• Trichloroethene (TCE)
• Cis-1,2-dichloroethene (cis-1,2-DCE)
• Trans-1,2-Dichloroethene (trans-1,2-DCE)
• Vinyl Chloride
• Petroleum hydrocarbons, and
• 1,4-Dioxane
These COCs have been detected in groundwater, soil, and soil vapor onsite as described further in Section 2.5. Figure 2 shows monitoring well and previously used extraction well locations and Figure 3 provides VOC and 1,4-dioxane concentrations in shallow/perched groundwater. Figure 4 shows previous soil sampling locations and Figure 5 provides TCE concentration contours for soil vapor. TCE has been detected Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

at the highest concentrations in soil vapor and is the COC driving the need for remediation. The Settlement Agreement has set SVE remedial goals based on TCE concentrations in soil vapor. The remedial goals require the SVE to operate until one of the two following remedial goals are met:
(1) TCE concentrations in soil vapor have reduced to a concentration of 3,000 micrograms per cubic meter (µg/m3) based on a human health vapor intrusion risk level of 1 x 10-5 incremental lifetime cancer risk (ILCR) (based on an attenuation factor of 0.01); or (2) If the first remedial goal (1) is not met, the SVE system has operated for two (2) years (and accounting for any SVE System Interruptions as set forth in the Settlement Agreement), and TCE concentrations have reduced to a concentration of 30,000 µg/m3 or less and based on a risk level of 1 x 10-4 ILCR; then the remedial goal shall be achieved by installation of a vapor mitigation system (VMS) at the former SEMCO building. After installation, the SVE system, including VMS, shall be owned and the responsibility of the current owner of the SEMCO Property.

To determine if remedial goals are met, the SVE system will be shut down and soil vapor samples will be collected following a suitable rebound period based on the site-specific conditions and findings from shutdown sampling events at weekly intervals until concentrations are stabilized or can be used to estimate rebound time constants (DTSC, 2011). These soil vapor samples will be collected to represent equilibrium soil vapor concentrations following the removal and treatment of soil vapor by the SVE system. Remedial goals will be compared to the 95% upper confidence level (95% UCL) of the mean soil vapor concentrations, calculated using data from existing soil vapor probes SV8, SV11, SV12, SV15, SV16, and SV17 and five of the SVE wells that will be installed/utilized for SVE remediation SVE-1, SVE-3, SVE-5, SVE-6, and SVE-8 (Figure 6).

1.2 Work Plan Organization
This Work Plan is organized as follows: Section 2.0 presents background information including a description of the Site and its history, the geologic and hydrogeologic setting, a summary of prior Site investigations and remediation, and the current extent of soil and vapor contamination in the shallow/perched zone; Section 3.0 outlines the SVE design basis for the proposed SVE system; Section 4.0 presents the SVE startup, and operation, maintenance, monitoring and reporting program; Section 5.0 outlines quality control/quality assurance (QA/QC) requirements for field and laboratory procedures; and Section 6.0 provides the documents referenced in this Work Plan. Supporting information is included in the attached tables, figures, and appendices which follow the text.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

2.0 BACKGROUND

2.1 Site Description and History
The approximately 7.31-acre Site is comprised of six parcels (Santa Barbara County Assessor’s Parcel Number [APNs] 111-291-035 through 111-291-038, 111-291-041, and 111-291-042) located in Santa Maria east of the Santa Maria Public Airport. The Site is bounded by Industrial Parkway and commercial/industrial businesses to the west, commercial/industrial businesses to the north and south, and the Santa Maria Valley Railroad Trail followed by the Santa Maria Country Club to the east. The nearest residential neighborhood is east of the Santa Maria Country Club over 1,000 feet from the Site. An inactive Santa Maria municipal water supply well (Well 2AS), which was shut down in 1985, is located near the southern Site boundary. Apart from an easement to the City of Santa Maria for Well 2AS, the Agencies do not own or control the Site.

As described by the CCRWQCB Order, the Site was developed in 1942, when it began operation as part of the Santa Maria Lompoc Army Air Base until 1946. From approximately 1949 to 2001, the Site was occupied by a precision tool manufacturing business producing precision drilling bits and related cutting tools operated by SEMCO. SEMCO used cutting oil (a petroleum hydrocarbon -based lubricant), TCE, and 1,1,1-trichloroethane (1,1,1-TCA) onsite during unstated and apparently disputed time periods. VOCs were reportedly stored onsite in aboveground storage tanks (ASTs) and the cutting oil was stored in an underground sump. The United States Army had at least two underground storage tanks on the property (T1242 and T1273). Based on previous sampling results available on GeoTracker indicating elevated concentrations of total petroleum hydrocarbons, TCE and 1,1,1-TCA, CCRWQCB suspects SEMCO discharged waste on the property. Former municipal supply Well 2AS was reported to have TCE concentrations of up to 59 micrograms per liter (µg/L) between 1984 and 1985, above the drinking water standard of 5 µg/L1 (Cleanup and Abatement Order No. R3-2023-0070 Former SEMCO Twist Drill and Tool Company, Inc. et al., 2023).

2.2 Site Geology
The Site is located in the Santa Maria Valley in Santa Barbara County, California. The regional geology consists of Pliocene to recent fluvial river channel deposits, alluvium, and terrace deposits surrounded by the Orcutt and Paso Robles formations and tertiary rocks and terrestrial sand dunes. Various tectonic events created the California Coast Ranges and the Transverse Ranges of Southern California, which are present to the south, west and east of the Santa Maria Valley (Worts, 1951).

1 San Francisco Bay Regional Water Quality Control Board (SFRWQCB) Groundwater Direct Exposure Environmental Screening Level (ESL) – Maximum Contaminant Level (MCL) Priority (July 2019).

Attachment B
Work Plan For Onsite Soil Vapor Extraction
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Santa Barbara County, California
(Global ID No. SLT3S0301290)
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Subsurface lithology at the Site has been characterized as four lithologic units based on past investigation activities at the Site (Analytical Consulting Group, Inc. [ACG], 2021a). SVE implementation is intended for the shallow/perched zone. This zone is the uppermost unit (Unit 1) from the ground surface to approximately 38 to 40 feet below ground surface (bgs). This zone consists of clayey fine- to medium-grained sand and silty fine-grained sand, to a well-sorted fine- to medium-grained sand with light brown to tan color. Minor lenses of clayey silt and silty clay up to 6 inches thick are found within this unit, particularly at approximately 15 feet bgs. This shallow/perched zone is bound by the upper middle lithologic unit (Unit 2). The boundary between the two units is between 38 and 40 feet bgs and Unit 2 ranges in thickness from approximately 8 to 20 feet.

The lithologic composition of this unit is variable, consisting of interlayered clayey sand, sandy silt, sandy clayey silt, and silty clay. Minor amounts of clean fine- to medium-grained sand, clay, and clayey gravel exist throughout Unit 2.

The lower two lithologic units are not considered part of the shallow/perched zone and are not included as part of this Work Plan. Available boring logs and well completion logs are included in Appendix A and subsurface profiles completed by others are included in Appendix B.

2.3 Site Hydrogeology
The Site is located within the Santa Maria River Valley Groundwater Basin (CA Department of Water Resources [DWR], 2004), which generally contains unconsolidated gravel, sand, silt, and clay in undifferentiated alluvial, river channel, and dune sand deposits. Groundwater is found in at least two distinct saturated zones: a perched water-bearing zone (shallow water-bearing zone), with groundwater present from approximately 10 feet bgs to an aquitard located at approximately 40 to 50 feet bgs and a deeper, regional water-bearing zone (deep water-bearing zone) at approximately 210 feet bgs. Groundwater flow beneath the Site is assumed to be to the south in the deep zone based on reported groundwater elevations in nearby water supply wells. The deep water-bearing zone groundwater underlying the Site is of beneficial use/suitable for agricultural water supply, municipal and domestic water supply, and industrial use by the CCRWQCB (CCRWQCB, SWRCB, and CalEPA, 2019).

During groundwater investigations at the Site, multiple onsite groundwater monitoring wells were installed (Figure 2). Between 1987 and present, first encountered groundwater in the onsite perched/shallow zone was observed between 7 and 35 feet bgs and first encountered groundwater in the deep groundwater- bearing zone was observed between 127 and 190 feet bgs. Groundwater is encountered inconsistently in the perched/shallow zone, with several wells encountering dry conditions across the various monitoring events. During the most-recent monitoring event in 2021, shallow groundwater was observed at variable depths between 10 and 34 feet bgs. A summary of onsite well construction details and historical Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
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groundwater elevations for shallow/perched zone monitoring wells relevant to this workplan are provided in Tables 1 and 2.

2.4 Prior Site Investigations and Remediation
Various historical investigations and remediation activities have occurred at the Site between approximately 1985 and present following TCE being found in former municipal supply well 2AS. A groundwater extraction and treatment system was installed onsite in 1992. The treatment system was briefly operational in 1992, and then was offline from 1992 to approximately 1994, before operating again until 2000. Five groundwater extraction wells were connected to the groundwater treatment system. The extraction wells pumped water into a 500-gallon transfer tank and then to a treatment system that of consisted of two or three Carbtrol® granular activated carbon (GAC) absorption canisters in series. Following treatment, the extracted water was either used for irrigation on the western side of the SEMCO building or was reinjected into the subsurface (Tetra Tech, 2000). The extraction wells are shown on Figure 2.

Historical sampling locations are shown on Figures 3 through 5 and historical analytical data are included as Tables C1 through C4 in Appendix C. Pre-2003 sampling activities included soil sampling between 1988 and 1991, soil vapor sampling in 1989, and groundwater monitoring between 1990 and 2003. Sixteen (16) groundwater monitoring wells were installed in the shallow/perched groundwater zone and five monitoring wells2 were installed in the deep aquifer (well completion depths of approximately 199 to 207 feet bgs). One of the deep aquifer wells (DMW-1) was abandoned prior to 2003 and construction records are not available for well DMW-5. Available well completion and boring logs are provided in Appendix A.

2.5 Recent Sampling Results
Recent soil, soil vapor and indoor air sampling was conducted in 2021 and 2022 and is described below.

Groundwater sampling results from 1988 to 2021 for VOCs and 1,4-dioxane are summarized on Figure 3 and in Table C-1.

2.5.1 Soil
In 2022, soil within the shallow zone was sampled between 5 and 50 feet bgs onsite (Figure 4).

Concentrations of COCs, particularly TCE, generally increase with depth to approximately 40 feet bgs where the lithology transitions from predominantly sand to silt. Concentrations of TCE then generally decrease from 40 to 50 feet bgs within the silty soils. Increased concentrations of TCE at soil boring B221, near the

2 A fifth deep aquifer monitoring well was identified during the 2021 monitoring well investigation but was not identified in other Site documents reviewed by Langan. This well is noted as "DMW-5" in Table 1.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
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presumed source area, were also detected around 15 to 20 feet bgs, where a higher fines and clay content than surrounding soil was observed (ACG, 2022b). Therefore, TCE likely sorbed to the clayey and silty layers in the shallow zone and may still be present, at decreased concentrations.

2.5.2 Soil Vapor
A round of shallow soil vapor samples was collected in 2021 in and around the presumed source area near B221 from depths ranging from sub-slab to 5 feet bgs. In general, concentrations of soil vapor are highest within the presumed source area and decrease radially outwards (Figure 5). Concentrations decrease rapidly to the east and south and appear to extend laterally to the north and west towards SV17 and SV8. The highest TCE and cis-1,2-DCE concentrations were detected at SV15 at 1,000,000 µg/m3 and 4,000,000 µg/m3, respectively. SV15 is located near the maximum TCE concentrations in soil (B221) and perched groundwater (MW-10). The target treatment zone is based on the 2021 soil vapor TCE concentrations detected above 3,000 µg/m3 as shown in Figure 5.

2.5.3 Indoor Air
Two rounds of indoor air samples were collected in 2021 and 2022 within the former SEMCO building and nearby storage building (ACG, 2021b; ACG, 2022a). Samples were collected over a 12-hour period when the buildings were closed and unoccupied. VOCs were not detected above applicable RWQCB commercial/industrial environmental screening levels3 in indoor air samples. Based on these results, soil vapors from beneath the building slab are not migrating into the onsite buildings at unacceptable levels and there was no observable indoor air concern.

3.0 SVE DESIGN BASIS AND CONSTRUCTION METHODOLOGY
This section provides the design basis and construction methodology for onsite SVE implementation.

The basis of design described herein is centered on the currently understood Site conditions as described in Section 2.0 and may be adjusted, as needed, during implementation. Per the Settlement Agreement Exhibit A, the system permitting, installation, startup and startup reporting will be completed within 350 days of the effective date of the Settlement Agreement4.

3.1 SVE Design
Onsite SVE implementation is intended to include an SVE system with vapor treatment and capacity to manage extracted moisture. The target treatment zone (Figure 6) encompasses the observed extent of TCE

3 https://www.waterboards.ca.gov/sanfranciscobay/water_issues/programs/ESL/ESL_Summary_Tables_Rev3.pdf 4 Subject to extension if air permit is not issued within 180 of application submittal.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
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Santa Barbara County, California
(Global ID No. SLT3S0301290)
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in soil vapor above the vapor intrusion risk management range of 1 x 10-5 (3,000 µg/m3 TCE) based on the 2021 onsite soil vapor sampling results (Figure 5). The target treatment zone extends laterally approximately 140 feet north and northwest, 65 feet southwest, and 30 feet southeast from sample location SV15, which had the highest reported TCE concentrations in soil vapor in 2021. The target treatment area is approximately 17,000 square feet. Based on the known Site conditions (Appendices A through C), the vertical target treatment zone is “in the shallow zone (to the low permeability layer at the bottom of the perched zone at approximately 50-foot bgs” and is predominantly sand. This vertical target treatment interval is from the ground surface to the first observed clay interval, up to 50 feet bgs. Therefore, the target treatment zone is approximately 850,000 cubic feet.

3.1.1 Pore Volume Exchange Assessment
The remedial effectiveness of an SVE system is generally dependent upon the number of pore volume exchanges that can be achieved within the target treatment zone. Consistent with United States Army Corps of Engineers (USACE) and United States Environmental Protection Agency (USEPA) guidance, the design has been developed based on a target of at least 1,500 pore volume exchanges per year within the target treatment zone considering the site-specific lithology and COCs. The overlapping radius of capture for the SVE wells closest to the source area will likely result in up to 2,500 pore volume exchanges per year.

Considering the higher sand content within the target treatment zone, a lower number of pore volume exchanges is anticipated to effectively treat the impacted vadose zone soils than would be required for material with a higher clay content. Sand also increases the potential for mass transfer and does not adsorb contaminants like clays, thus, lowering the potential for back diffusion. TCE, the primary COC, is a volatile and readily stripped compound and as such, is expected to be readily removed by SVE.

3.1.2 SVE Radius of Capture
The radius of capture for SVE well spacing is based on vacuum influence, pore volume exchanges and establishing a critical pore velocity. The following criteria were considered to determine the design spacing for the SVE wells:
• Based on the Site lithology (sands with some silts) and the contaminant of concern (i.e., TCE is volatile), the number of pore volume exchanges within the target treatment zone was selected to be at least 1,500 pore volume exchanges.
• Balance between the number of wells and the total air extraction flow rate and vacuum capacity of the system. The radius of capture of each well can be increased with an increase in the air extraction flow rate, which may potentially reduce the number of wells required, though may require larger vacuum capacity.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

• In general, design calculations estimate the influence of one extraction well. It is a known phenomenon that the estimated vacuum influence and pore volume exchanges will be enhanced when multiple wells are operating concurrently within the treatment zone.

The SVE radius of capture was calculated to be 28 feet based on Site-specific information including a porosity of 0.3 based on sands and silty sands, a screen length of up to 50 feet, an air extraction flow rate of approximately 120 cubic feet per minute (cfm) per extraction well, and the target design number of at least 1,500 pore volume exchanges per year (Fetter, 2014). This radius of capture and air extraction flow rate results in approximately 1,800 pore volume exchanges per year per extraction well (Figure 6). At these extraction rates and radius of capture, the volumetric pore gas velocity is approximately 0.03 centimeters per second (cm/s) which is above the critical pore gas velocity of 0.001 cm/s (USACE, 2002; USEPA, 2001; Dixon and Nichols, 2006).

3.1.2.1 Mafi Trench Pilot Test
Padre Associates, Inc. (Padre) completed a pilot study for dual-phase extraction (DPE) wells in May and June 2024 at the Mafi Trench site at 3037 Industrial Parkway (Figure 1), located approximately 900 feet southwest from the onsite area of SVE implementation. As described in Padre’s Interim Remedial Action Report, High-Vacuum Dual Phase Extraction Pilot Test, California (Global ID No. SLT3S0301290), the geology and hydrogeology at 3037 Industrial Parkway is similar to Site conditions (Sections 2.2 and 2.3; Padre, 2024).

The Mafi Trench pilot study estimated a radius of influence (ROI), using a minimum vacuum of 0.1 inches of water (0.007 inches of mercury [inHg]), ranging from 67.5 feet to 107 feet based on vacuum levels of between 19 inHg and 22 inHg and flow rates of between 12 cfm and 43 cfm at three extraction wells.

The Mafi Trench DPE pilot tests may provide information on the air flow dynamics and gas-phase transport properties of the subsurface, which are useful for evaluating the potential for SVE to achieve mass removal through multi-pore-volume flushing. While the ROI is commonly reported to characterize vacuum propagation, the pilot testing provides useful design parameters for estimating cleanup effectiveness based on the flow rate achieved under vacuum and the observed vacuum response at known distances, which enable estimating soil gas pore velocities.

For example, at Mafi Trench well B-11, an average vapor flow rate of 43 cfm was achieved at 19.5 inHg vacuum, with detectable vacuum influence ( ≥ 0.1 inches of water) extending at least 25 feet radially, and still measurable, though below threshold, out to 130 feet. Based on a uniform circular area of influence within a 25-foot radius, the extracted gas volume corresponds to a volumetric pore gas velocity on the order of approximately 0.02 cm/s, which is above the critical pore gas velocity of 0.001 cm/s (USACE, 2002; USEPA, Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
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2001; Dixon and Nichols, 2006). Even in wells with lower flow rates, such as B-10 (12 cfm at 21 inHg), measurable vacuum response within 23 feet indicates soil vapor can be transported over a broad area.

These measured flow rates and pressure gradients indicate that under continuous SVE operation, the system can capture the target pore volumes.

For the SEMCO Site, which has similar lithology and target contaminants, this indicates that the SVE as designed has sufficient well density under the appropriate applied vacuum and has the potential to flush more than 1,000 pore volumes in one year.

3.1.3 SVE Layout
Based on the estimated effective capture radius of 28 feet for each SVE well, eight SVE wells will be operated within the target treatment zone spaced approximately 56 feet apart as shown on Figure 6 and as described in Section 3.3. The new SVE wells will be screened up to 50 feet bgs based on observed site lithology.

For SVE wells located outdoors, aboveground piping will connect each wellhead to the SVE control panel and GAC off-gas treatment system; wells located within the adjacent building will have sub-slab conveyance piping (Section 3.4).

Each wellhead will have a valve which allows the extraction well flow rate to be adjusted. The blower will be adequately sized to allow for up to 1,000 cfm with capacity up to 20 inHg. Extracted soil vapor will be treated through GAC vessels prior to discharge to the atmosphere in accordance with Santa Barbara County Air Pollution Control District (Air District) requirements . A knockout tank will collect extracted moisture/groundwater, as needed, and connect to a storage tank and potential treatment system prior to either discharge to the sanitary sewer system in accordance with applicable City of Santa Maria wastewater discharge permit requirements, or transport offsite by a vacuum truck for proper disposal. The knockout tank will have a water level sensor to shut down the SVE system in the event the storage tank and knockout tank reach capacity during operation.

3.2 Pre-Implementation Activities

3.2.1 Site-Specific Health and Safety Plan
Langan will prepare a site-specific health and safety plan (HASP) for the planned field activities. The HASP will include procedures, equipment, and materials/supplies to be used to protect workers and tenant health and safety during planned SVE implementation and monitoring activities. The HASP will meet or exceed the requirements set by OSHA’s Occupational Health and Safety Standards CFR 29, subpart 1910.120(b)(4).

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

3.2.2 Access and Permitting
Access agreements will be required with the current Site owners prior to proceeding with SVE system construction. It is also anticipated that the following permits will be required for SVE implementation and testing:
• Well construction permits from the Santa Barbara County Public Health Department, Environmental Health Services (EHS) for the planned SVE wells;
• Permit(s) from the Air District for SVE implementation (Form-07B and/or Form -77); and • Industrial wastewater discharge permit from the City of Santa Maria to discharge the groundwater extracted (and treated if necessary) to the sewer during SVE operation.

Per the Settlement Agreement Exhibit A, the air permit application will be submitted within 90 days of the effective date of the Settlement Agreement.

3.2.3 Survey and Utility Clearance
The proposed boring locations for the SVE wells will be delineated with white paint, and Underground Service Alert (USA) will be contacted at least 48 hours prior to the commencement of well installation activities.

Langan will also subcontract a private utility locator to evaluate the proposed boring locations for the presence of underground utilities. Additionally, the well locations will be cleared using soft-digging techniques to at least 5 feet bgs prior to drilling.

3.2.4 Agency Notification
Langan will notify the CCRWQCB at least five days prior to initiating field activities. Langan will notify the Air District and City of Santa Maria in accordance with their respective requirements / permit conditions.

3.3 Well Construction Methodology

3.3.1 SVE Well Construction
Langan will observe and document the construction of the SVE wells. Each boring will be advanced using hand auger/tools and hollow-stem auger drilling techniques. Borings will first be cleared to approximate depths of 5 feet bgs using hand auger/tools and will be advanced to final depths of up to 50 feet bgs using the hollow-stem auger drilling rig operated by a C-57 licensed drilling contractor. The soil borings will be visually logged by Langan personnel in general accordance with the Unified Soil Classification System (USCS), working under the supervision of a California licensed professional geologist, and will note first encountered Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
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groundwater, if observed. Soil will be field screened for organic vapors using a photoionization detector (PID) and examined for visual staining and odors.

The SVE wells will be constructed using 4-inch diameter, schedule 40 polyvinyl chloride (PVC) casing.

The wells will be screened up to 50 feet bgs using 0.010-inch factory slotted screen casing in general accordance with USEPA (USEPA, 2017) and California Well Standards (California DWR Bulletins 74-81 and 74-90) guidance. Blank casing will be used to complete the well from the top of the screened interval to grade. The boring annulus will be backfilled with #2/12 filter pack sand from the bottom of the boring to approximately 1 foot above the screened portion. A one- to two-foot-thick hydrated bentonite-chip seal will be placed above the filter pack sand followed by at least a one-foot- thick cement seal to the ground surface.

Each well will be completed with a locking expansion cap and a flush-mounted, traffic-rated well box set in concrete. Permanent construction techniques, including use of neat-cement grout and well box installation will be implemented in accordance with the Advisory for Active Soil Gas Investigations (CalEPA, 2015). Well construction records (California DWR Form 188) will be submitted to the DWR in accordance with applicable permit requirements. Depth to groundwater, if present, will be recorded once the well has stabilized.

Associated SVE wellheads, including a sampling probe to allow for influent and groundwater sampling, will be installed as part of SVE implementation and will connect to the main SVE system header. A typical well construction diagram is included as Figure 7 and well construction details are included as Table 3.

3.3.2 Well Box Installation at Existing Soil Vapor Monitoring Probes The existing soil vapor probes installed by ACG as part of the 2021 soil vapor sampling were not observed to have well boxes. Therefore, well boxes will be installed at the following six existing soil vapor probes proposed for monitoring required by the Settlement Agreement:
• SV8
• SV11
• SV12
• SV15
• SV16
• SV17
If existing vapor probes are damaged or not usable, reinstallation of soil vapor probes will be documented in the Construction Completion Report (Section 4.1.3) and will proceed in general accordance with the soil gas probe construction approach outlined in the Site Assessment Workplan for Monitoring Well Evaluation, Soil Vapor Sampling, and Indoor Air Sampling (ACG, 2021a).

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

3.4 SVE System Equipment
The full-scale SVE system is anticipated to include the following equipment, or equivalent:
• vapor extraction equipment, including:
o a blower capable of providing up to 20 inHg vacuum at the inlet and 1,000 cfm total air flow rate; o vapor-liquid separator knockout tank;
o transfer pump, and
o associated dilution filter, instrumentation, and valving5; • vapor treatment equipment, including two vapor-phase granular activated carbon (VGAC) vessels connected in series; and
• up to a 2,000-gallon holding tank for temporary storage of extracted moisture/groundwater.

The SVE system is anticipated to be stored in the back lot behind the main building in a fenced area. Additional description of the SVE system equipment is provided in the following sections.

3.4.1 Vapor Extraction and Treatment Equipment
The vapor extraction and treatment equipment is anticipated to be housed in either a trailer or shipping container and include an adequately sized vapor extraction system with the required power service. Wellhead connections, including vacuum gauges and well caps with test ports for collection of vapor samples and a ball valve, will be installed on each of the extraction wells. Wellhead connections will also include an opening and seal for the placement of down-well equipment for groundwater gauging and sampling, if needed6.

Vacuum gauges and well caps will also be installed on observation wells for vacuum measurements. The wellheads will be connected to a main SVE system influent line (main header) prior to treatment. Vapor lines from all wells will manifold to a main header pipe that leads to the inlet of the proposed process equipment.

The wells will manifold above grade to the main header pipe via individual well lines. Monitoring equipment along the individual branches and/or main header lines will include flow meters, vacuum gauges, temperature sensors, sampling ports, and flow -control valves, as needed. The knock -out tank will separate moisture/groundwater which may be extracted as part of SVE system operation and pump it to the liquid holding tank. Extracted vapor will be treated using at least two adequately sized VGAC vessels, placed in

5 Valving will include at minimum, a valve at every wellhead to allow for adjustments to the flow rate for each well. 6 While not anticipated, wellhead connections will allow for installing submersible pumps for additional groundwater extraction.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

series, to accommodate a maximum flow of 1,000 cfm prior to discharge to the atmosphere in accordance with Air District permit requirements.

3.5 Air Emissions Controls
Extracted vapors will be treated through VGAC filters to reduce the COCs and meet the requirements of the Air District permit. Sampling will be conducted on a regular basis from influent and effluent sampling ports to determine mass removal and emissions quantities in accordance with applicable permit requirements. If the SVE system vapor treatment does not meet permit requirements, vapor extraction will be temporarily stopped, and the treatment system will be adjusted to meet the permit requirements, as necessary.

Air District permit application forms are included in Appendix D. Preliminary estimated VOC emissions are provided in Table 4.

3.6 Contingencies

3.6.1 Groundwater
Moisture extracted as part of SVE system operation will be separated from the vapor prior to treatment and stored in a holding tank, as needed. The design is predicated on the perched groundwater zone not being temporally continuous based on well gauging information from 2021. Perched groundwater levels may fluctuate significantly with precipitation with increases in the rainy season (approximately October – March) and decreases in the dry season (approximately April – September) and therefore extraction is not intended to occur continuously during SVE implementation. The wellhead connections for the SVE system will also allow for the installation of a submersible pump for groundwater extraction, if needed during periods of groundwater infiltration in the area (e.g., during and following the rainy season). If submersible pumps are used, the extracted groundwater will be treated using bag filters to remove fines, as needed, and liquid phase GAC vessels of adequate capacity placed in series. The existing water treatment system will be visually assessed prior to groundwater treatment and might be retrofitted, if possible and, as needed, to adequately treat the groundwater prior to discharge in accordance with applicable permits. If the existing water treatment system is no longer viable, a new system will be installed.

Treated water will be discharged to the sewer system under an industrial wastewater discharge permit through the City of Santa Maria. Sampling will be conducted from influent and effluent sampling ports per discharge permit requirements. If effluent does not meet permit requirements, discharge will be temporarily stopped and the treatment system will be adjusted to meet permit requirements, as necessary. SVE system operation may continue while the groundwater treatment system is paused pending adequate space in the Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

groundwater storage tanks. A permit application for sewer discharge from an industrial facility is included in Appendix D.

3.6.1.1 Baseline Groundwater Sampling
In accordance with the Settlement Agreement and the Offsite and Onsite Groundwater Characterization Work Plan, September 2025, baseline groundwater samples and depth to groundwater measurements will be collected from shallow/perched groundwater monitoring wells (MW-1 through MW-16). The depth to water measurements will be used to verify groundwater presence and quantity and anticipated VOC concentrations requiring treatment. Additionally, as required, a groundwater sample will be analyzed for the constituents outlined in the City of Santa Maria industrial wastewater discharge permit.

3.6.1.2 Extracted Groundwater Influent and Effluent
As needed, groundwater influent (untreated) and effluent (treated) will be analyzed for constituents outlined by the discharge permit requirements and COCs and evaluated to estimate mass removal of the groundwater treatment system. If quantities are low enough, groundwater may be containerized, sampled for waste characterization, and appropriately disposed of instead of treating and discharging to the sewer.

3.6.2 Potential Short Circuiting
Cracked pavement and existing groundwater extraction wells might provide preferential pathways for ambient air to travel into the subsurface and allow short-circuiting, reducing the vacuum for nearby soil vapor extraction wells. While the extraction wells are designed to prevent flow from ambient air from the immediate surrounding area, the radius of capture will extend past the well box and is therefore influenced by existing wells and the surrounding pavement. Startup testing results will be reviewed, and the conditions within the target treatment capture area assessed. If preferential pathways are identified that could allow the extraction wells to pull ambient air and reduce the vacuum in the subsurface, the pavement will be sealed. Existing extraction wells will be fitted with new, locking expansion caps, as needed, based on existing conditions.

3.6.3 Location and Elevation Survey
If groundwater accumulates and must be extracted and treated prior to discharge, the affected wells will be surveyed by a California-licensed Professional Land Surveyor. Vertical and horizontal locations, including sampling ports, outlets, and ground surface elevation, will be measured in accordance with the State of California’s GeoTracker (GeoTracker) requirements. Following completion of installation and surveying, the survey data will be uploaded to the GeoTracker Electronic Submittal of Information (ESI) system.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
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Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

3.6.4 Site Power Supply Evaluation
SVE systems are generally considered energy-intensive and require industrial-level Site power supply. Prior to implementation, the Site power supply will be evaluated to ensure access to an energy system with the capacity to run the system continuously. The Pacific Gas & Electric Company (PG&E) supplies the energy service to Santa Maria and will be contacted, as needed, to confirm the capacity of the current energy system.

Due to the Site location within a heavily industrial area, it is likely that the energy service is within the required range. In the event the power draw is greater than the system’s current capacity, alternative lower-energy systems may need to be considered as a new power supply drop or transformer from PG&E generally has a lead time of over a year.

3.7 System Telemetry Requirements
Wireless telemetry will be used to provide real-time alarms, including blower status, groundwater storage tank level, vacuum levels, and/or pressure sensors on the groundwater treatment system. The use of the remote telemetry will allow for reduced system downtime.

3.8 Waste Management
Spent GAC media will be transported for offsite recycling or disposal at an approved facility. Documentation for the recycling or disposal of the spent GAC media will be provided in the Semi-Annual SVE Progress Report and/or SVE Completion Report, depending on timing.

4.0 SVE OPERATION, MAINTENANCE AND MONITORING

4.1 SVE Startup Testing
The objective of the SVE startup testing is to refine system parameters and optimize effectiveness of the system. The startup testing will be focused to address the area of highest observed soil vapor concentrations.

Testing for the SVE system will be performed for up to two weeks to refine the system operation as needed.

The SVE system will operate for up to 24 hours a day and be monitored by field technicians from the SVE system manufacturer with oversight from Langan personnel. Startup testing may include field monitoring, performing stepped rate and constant rate vacuum tests, and sampling.

System operating parameters including temperature, vacuum, influent flow (cfm), applied well-head vacuum, and vacuum at observation wells will be recorded at least three times per day during system startup operation. Total VOC concentrations will be measured in the field using a PID.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

4.1.1 Startup Phase Groundwater Levels
Prior to startup testing water levels will be gauged at monitoring wells (Figure 2) to verify the lack of or depth of perched groundwater on the Site and in the SVE implementation area. If present, potential groundwater removal will be managed as indicated in Section 3.6.1.

4.1.2 Sampling
During startup testing, soil vapor sampling will be conducted to document initial COC concentrations as a baseline from which to evaluate SVE effectiveness and to optimize mass removal and achieve treatment requirements in accordance with Air District permits.

4.1.2.1 Baseline Soil Vapor Sampling
Baseline soil vapor samples will be collected from the six soil vapor probes and five SVE wells intended for SVE performance monitoring within the SVE target treatment zone:
• SV8
• SV11
• SV12
• SV15
• SV16
• SV17
• SVE-1
• SVE-3
• SVE-5
• SVE-6
• SVE-8

Samples from soil vapor probes will be collected using 1-liter laboratory-supplied summa canisters and flow controllers while using a sealed shroud to facilitate leak testing. Soil vapor probes will be purged of three times their volume prior to sampling in accordance with the California Department of Toxic Substances Control’s (DTSC) Active Soil Gas Advisory. A leak tracer gas, such as helium, will be used to confirm leakage does not occur during sampling. A known concentration of the tracer gas (about 20% to 30% helium by volume) will be added inside the shroud and maintained at this concentration during sampling. Tracer gas concentrations within the soil vapor samples will be tested at the laboratory to verify the quality of the field sampling. In addition to laboratory testing, a tracer gas monitoring device will be used to evaluate leakage occurring in real time by testing the sample train following purging and sample collection. Soil vapor samples from SVE wells will be collected in tedlar bags using a soil vapor pump or in 1-liter laboratory supplied summa canisters with flow controllers. SVE wells will be fitted with a temporary sampling port to facilitate sample collection.

Samples will be submitted under chain of custody protocol to a State of California Environmental Laboratory Accreditation Program (ELAP)-certified laboratory and analyzed for VOCs by USEPA Method TO-15. Soil vapor samples from soil vapor probes will additionally be analyzed for helium by ASTM Method D1946 if helium was used as the tracer gas, as applicable.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

4.1.2.2 SVE Vapor Influent and Effluent
Soil vapor samples from the SVE system will be collected from the wellhead or blower inlet for the five SVE wells intended for SVE performance monitoring (SVE-1, SVE-3, SVE-5, SVE-6, SVE-8) during the initial field monitoring, periodically during operation, and just before system rebound testing and shutdown. Samples will also be collected from the blower inlet, at a sampling port between GAC vessels, and from an effluent sampling port from the soil vapor treatment system at a minimum at initial startup and just before system rebound testing and shutdown. These samples will also be collected periodically based on PID monitoring results and in accordance with the Air District Permit to better understand the SVE treatment system operation.

Soil vapor samples will be collected into tedlar bags or 1-liter summa canisters, submitted under chain of custody protocol to a State of California ELAP-certified laboratory, and analyzed for VOCs by USEPA Method TO-15.

4.1.3 Construction Completion Report
Following installation of the SVE, the Agencies will prepare a SVE Construction Completion Report. The SVE Construction Completion Report will include a summary of the soil vapor monitoring locations, well box installation, final design plans, boring logs, SVE well construction logs, SVE startup activities, treatment system specifications, and describe construction activities. The report will be signed and certified by a Professional Geologist and/or Professional Engineer registered in the State of California.

4.2 Performance Monitoring
Per Table 1 of the Settlement Agreement the Agencies will complete monthly maintenance and four semi-annual monitoring events to assess the performance of the SVE system during operation. Quality control samples will be collected using a PID from various sampling ports on the SVE system, such as the blower inlet and VGAC outlet, and soil vapor monitoring samples will be collected from existing vapor probes or SVE wellheads.

The results of performance monitoring and quality control sampling for the SVE system will be included in the Semi-Annual progress reports. Reports will be completed for as long as the system is in operation and submitted by April 30th for the operating period of October to March and by October 31st for the operating period of April to September, per Exhibit A of the Settlement Agreement.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

4.3 Remedial Goals, SVE Discontinuation, and Contingency VMS Per the Settlement Agreement, the agencies shall operate the SVE system until one of the following remedial goals is reached:
• TCE concentrations in soil vapor have reduced to a concentration of 3,000 µg/m3 and corresponding human health vapor intrusion risk level of 1x 10-5 ILCR (based on an attenuation factor of 0.01); or • If the first remedial goal (1) is not met, the SVE system has operated for two (2) years (and accounting for any SVE System Interruptions as set forth in the Settlement Agreement), and TCE concentrations have reduced to a concentration of 30,000 µg/m3 or less and based on a risk level of 1 x 10-4 ILCR; then the remedial goal shall be achieved by installation of a VMS at the former SEMCO building. After installation, the SVE system, including VMS, shall be owned and the responsibility of the current owner of the SEMCO Property.

Following the completion of SVE system operation, soil vapor monitoring will be conducted following a suitable rebound period based on the site-specific conditions and findings from post-shutdown vapor sampling at weekly intervals until concentrations are stabilized or can be used to estimate rebound time constants (DTSC, 2011). Remedial goals will be compared to the 95% UCL of the mean soil vapor concentrations, calculated using data from existing soil vapor probes SV8, SV11, SV12, SV15, SV16, and SV17 and five of the SVE wells that will be installed/utilized for SVE remediation SVE-1, SVE-3, SVE-5, SVE-6, and SVE-8 (Figure 6), per the Settlement Agreement.

If determined necessary based on the risk evaluation, a VMS may be required for the SEMCO building. If required, the perforated pipe installed beneath the SEMCO building will be connected to a riser, the installed inlet vent will be uncapped, and a radon fan will be installed on the riser and operated by the building owner as outlined in Appendix E. A VMS basis of design schematic is attached as Appendix E.

Once the SVE meets the remedial goals described above, the system will be discontinued, and the Agencies will submit a SVE Completion Report to the CCRWQCB. The SVE Completion Report will include final monitoring data, removal of SVE media onsite, and abandonment of the SVE wells.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

5.0 QUALITY ASSURANCE/ QUALITY CONTROL
The Quality Assurance / Quality Control (QA / QC) procedures will be utilized in both sample collection and chemical analyses. The purpose of the QA/QC procedures is to ensure the reliability and validity of data generated during the monitoring events described in this work plan. QC samples will be collected during field activities, including field duplicate(s), an equipment blank, and a trip blank sample.

5.1 Field QA / QC Procedures
Field QA/QC procedures will be performed during sampling activities and will consist of the following measures:
• Chain of custody records will be used to document sample collection and will be submitted to the laboratory performing the chemical analyses. A chain of custody record will accompany all samples submitted for chemical analyses; and
• Daily information regarding sample collection will be recorded in field logs, including sample type(s), description, sample identification number(s), and sample time(s).

Field QA/QC samples will be collected and submitted for chemical analyses along with the samples, and will including the following:
• Field Duplicate Sample: One duplicate sample will be collected at a rate of once per sampling event or 10%, whichever is greater, and analyzed to evaluate the analytical procedures and methods employed by the laboratory. The duplicate sample will be collected concurrently with its parent sample and will be submitted for VOCs analysis.
• Equipment Blank Sample: One equipment blank sample will be collected per sampling day during the baseline groundwater sampling event to determine the efficacy of decontamination procedures for sampling equipment and will be collected when disposable or dedicated sampling equipment is not used. The equipment blank sample will consist of deionized water poured over or pumped through the decontaminated sampling equipment, and collection of the rinsate into the appropriate sample containers. The equipment blank sample will be submitted for VOCs analysis. • Trip Blank Sample: One trip blank sample will be submitted and analyzed per sampling event that includes water VOC analysis. The trip blank water sample will consist of a sample of deionized water provided by the laboratory and stored with the water VOC samples collected during each day of field activities. The purpose of the trip blank sample is to evaluate the potential for cross-contamination of Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

aqueous VOC samples during handling. The trip blank sample(s) will be handled in the same manner as all other samples and submitted for VOCs analysis.

5.2 Laboratory QA / QC Procedures
Laboratory QA / QC procedures include the following:
• Chemical analyses will be performed within the required holding time for all samples chemically analyzed, and
• A State of California ELAP-certified laboratory will conduct the required analyses.

The laboratory will provide the following information for each sample:
• Method blank data;
• Surrogate recovery, instrument tuning, and calibration data; and • Signed laboratory reports including the sample designation, date of sample collection, date of sample analysis, laboratory analytical method employed, sample volume, and the reporting limit (RL).

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

6.0 REFERENCES
Analytical Consulting Group, Inc. (ACG), 2021a. Site Assessment Workplan. Monitoring Well Evaluation. Soil Vapor Sampling. Indoor Air Sampling. Former Semco Twist Drill & Tool Company. 2936 Industrial Parkway.

Santa Maria, California. Site I.D. No. SLT3S2411351 (October 20, 2015, California Water Code [Water Code] section 13267 Investigative Order [2015 Order]). February 12.

ACG, 2021b. Results of Indoor Air Sampling, Former Semco Twist Drill & Tool Company. 2936 Industrial Parkway. Santa Maria, California. April 7.

ACG, 2021c. Monitoring Well Investigation Report, Former Semco Twist Drill & Tool Company. 2936 Industrial Parkway. Santa Maria, California. Site I.D. No. SLT3S2411351. July 16.

ACG, 2021d. Soil Vapor Sampling Report, Former Semco Twist Drill & Tool Company. 2936 Industrial Parkway. Santa Maria, California. Site I.D. No. SLT3S2411351. July 16.

ACG, 2022a. Results of Second Round Indoor Air Sampling, Former Semco Twist Drill & Tool Company. 2936 Industrial Parkway. Santa Maria, California. February 11.

ACG, 2022b. Site Assessment Report, Former Semco Twist Drill & Tool Company. 2936 Industrial Parkway.

Santa Maria, California. Site I.D. No. SLT3S2411351. May 25.

California Environmental Protection Agency Department of Toxic Substances Control (DTSC). 2011.

Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (Vapor Intrusion Guidance). October.

California Department of Water Resources (DWR). 1991. Monitoring Well Standards Bulletin 74-90. June 1991.

DWR, 2003, California’s Groundwater, Bulletin 118 – Update 2003, dated 2003.

DWR. 2004. California Department of Water Resources Santa Maria River Valley Groundwater Basin.

California’s Groundwater Bulletin No. 118. Last updated February 27, 2004.

California Environmental Protection Agency (CalEPA) Department of Toxic Substances Control (DTSC), 2010. Proven Technologies and Remedies Guidance Remediation of Chlorinated Volatile Organic Compounds in Vadose Zone Soil. April. Retrieved from:
https://dtsc.ca.gov/wp-content/uploads/sites/31/2018/11/cVOC_040110.pdf CalEPA DTSC, Los Angeles Regional Water Quality Control Board, and San Francisco Regional Water Quality Control Board, 2015. Advisory – Active Soil Gas Investigations. July.

Central Coast Regional Water Quality Control Board (CCRWQCB). 2023. Cleanup and Abatement Order No.

R3-2023-0070. Former Semco Twist Drill and Tool Company, Inc. ET AL. Industrial Parkway, Santa Maria Santa Barbara County. September 25.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

CCRWQCB, State Water Resources Control Board (SWRCB), and CalEPA, 2019. Water Quality Plan for the Central Coast Basin. June.

Dixson, K.L. and Nichols, R., 2006. Soil vapor extraction system design: A case study comparing vacuum and pore-gas velocity cutoff criteria. Remediation Journal 17(1). December. DOI: 10.1002/rem.20112 ERC Environmental and Energy Services Co., 1988. Subsurface Investigation Letter Report, SEMCO Twist Drill and Tool Company, Santa Maria, California. 1 April.

ERC Environmental and Energy Services Co., 1989. Subsurface Investigation: Phase 2, SEMCO Twist Drill and Tool Company Facility, Santa Maria, California, California. March.

ERC Environmental and Energy Services Co., 1990a. Supplemental Subsurface Investigation, SEMCO Twist Drill and Tool Company Facility, Santa Maria, California. March.

ERC Environmental and Energy Services Co., 1990b. Shallow and Deep Ground-water Investigation SEMCO Twist Drill and Tool Company Facility, Santa Maria, California. July.

ERC Environmental and Energy Services Co., 1990c. Remedial Action Plan for Shallow Aquifer System, SEMCO Twist Drill and Tool Company Facility, Santa Maria, California. August.

ERC Environmental and Energy Services Co., 1991. Results of Soil Sampling Beneath the Concrete Pond Structure Located at the SEMCO Facility, Santa Maria, California. 3 December.

Everest Services, Inc., 2004. 2003 Third Quarter Report for Groundwater Monitoring Activities at 2936 Industrial Parkway, APNs 111-291-027 & 028, Santa Maria, California. February 24.

Fetter, 2014. Applied Hydrogeology, Fourth Edition.

Langan, 2024. Groundwater Monitoring Network and Extraction and Treatment System Evaluation Workplan, 2926, 2936, 2946, 2956, 2976, and 2986 Industrial Parkway, Santa Maria, California. 25 March.

Langan, 2025. Draft Revised Offsite Deep Groundwater Monitoring Investigation Work Plan, 2926, 2936, 2946, 2956, 2976, and 2986 Industrial Parkway, Santa Maria, California. June.

National Drought Mitigation Center, 2025. United States Drought Monitor Time Series: Santa Barbara County, 2000-2025. https://droughtmonitor.unl.edu/DmData/TimeSeries.aspx.

Occupational Safety and Health Administration. Hazardous Waste Operations and Emergency Response.

Code of Federal Regulations. Title 29, Part 1910, Section 120(b)(4).

Padre, 2023. Interim Remedial Action Plan, High-Vacuum Dual Phase Extraction Pilot Test, 3037 Industrial Parkway, Santa Maria, Santa Barbara County, California, (GLOBAL ID NO. SLT3S0301290). Prepared for: EFT Enterprises, L.P. July.

Attachment B
Work Plan For Onsite Soil Vapor Extraction
2936 Industrial Parkway, Santa Maria
Santa Barbara County, California
(Global ID No. SLT3S0301290)
22 September 2025
781016901

Padre, 2024. Interim Remedial Action Report, High-Vacuum Dual Phase Extraction Pilot Test, 3037 Industrial Parkway, Santa Maria, Santa Barbara County, California, (GLOBAL ID NO. SLT3S0301290). Prepared for: EFT Enterprises, L.P. July.

San Francisco Bay Regional Water Quality Control Board (SFRWQCB), 2019. Environmental Screening Levels (ESLs): Groundwater Direct Exposure – Maximum Contaminant Level (MCL) Priority. July.

Switzer, C. and Kozzon, D. S., 2007. Soil Vapor Extraction Performance in Layered Vadose Zone Materials.

May. https://doi.org/10.2136/vzj2005.0131
Tetra Tech, Inc. (Tetra Tech), 1994. SEMCO Groundwater Remediation System Repair and Maintenance- Status Report, 2936 Industrial Parkway, Santa Maria, California, Contract No. 91-T0087, Task Order No. 3- 087-1.0-300478. 19 August.

Tetra Tech, 1998a. Water Treatment System, SEMCO Twist Drill and Tool Company, Santa Maria, California, Monitoring and Reporting Program (MRP) No. 92-16. 30 March.

Tetra Tech, 1998b. Semi-Annual Report of Groundwater Monitoring, SEMCO Twist Drill and Tool Company, Santa Maria, California. December.

Tetra Tech, 2000. Letter Report on the Status of the SEMCO Groundwater Treatment System and Present Specific Actions for Groundwater Cleanup Optimization. 1 November.

Truex, M. J., Becker, D. J., Simon, M. A., Oostrom, M., Rice, A. K., & Johnson, C. D., 2013. Soil Vapor Extraction System Optimization, Transition, and Closure Guidance (PNNL-21843, RPT-DVZ-AFRI-006).

Pacific Northwest National Laboratory. Prepared for the U.S. Department of Energy under Contract DE- AC05-76RL01830. February. Retrieved from: https://www.clu-in.org/download/techfocus/sve/pnnl- 21843.pdf
United States Army Corps of Engineers (USACE), 2002. Soil Vapor Extraction and Bioventing. 3 June.

United States Environmental Protection Agency (USEPA) Solid Waste and Emergency Response, 1999.

Multi-Phase Extraction: State-of-the-Practice. June.

USEPA Office of Research and Development, 2001. Development of Recommendations and Methods to Support Assessment of Soil Venting Performance and Closure. September.

USEPA, 2017. How to Evaluate Alternative Cleanup Technologies For Underground Storage Tank Sties, A Guide For Corrective Action Plan Reviewers, Chapter II Soil Vapor Extraction. October.

WESTEC Services, 1989. Subsurface Investigation SEMCO Twist Drill and Tool Company, Santa Maria, California. January.

Worts, G.F. 1951. Geology and Ground-Water Resources of the Santa Maria Valley Area, California.

Geologic Survey Water-Supply Paper 1000. 1951. Available online:
https://pubs.usgs.gov/wsp/1000/report.pdf
Attachment B

TABLES

Attachment B
Table 1
Onsite Well Construction Summary
SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
2003 2021
Well
Completion Log
(1988 - 1991)
Extraction Well
Permit
Application
(1992)
2003 2021 2003 2021
MW-1/SMW-1 -- Sampled Located, sampled, recharged
after purging 22 gallons 20 -- 24.7 24.9 11.15 10.9 5.21 - 20 2 inches 236.44/ 236.49 236.62/ 236.63 Flush mount with traffic box
Labeled as MW-12 on one map;
"could not grout surface casing"
noted on well construction log
MW-2/SMW-2 -- Sampled Located, well cover not able to
be removed 26 -- 20.31 -- 19.99 -- 5.2 - 25.2 2 inches 236.17/ 236.18 236.51/ 236.53 Flush mount with traffic box

0.31 feet of free product on top
of water in 2003; "surface casing
not grouted" noted on well
construction log
MW-3/SMW-3 -- Dry Located, well plug intact, dry
but moist at the bottom 24.5 -- 22.21 22.44 -- -- 9.5 - 24.5 2 inches 237.55/ 237.56 237.84/ 237.86 Flush mount with traffic box --
MW-4 NB-6 Dry Located, well plug intact, dry
but moist at the bottom 30 -- 30.4 29.52 -- -- 9.5 - 29.4 4 inches 236.09 236.42 Flush mount with traffic box
"dry well" noted on construction
log
MW-5 NB-7 Sampled
Located, well plug intact but
casing and well box damaged,
dry but moist at the bottom

29.5 -- 29 29.02 9 -- 8.8 - 28.9 4 inches 237.80 238.07 Flush mount with traffic box
"dry well" noted on construction
log
MW-6 NB-12 Sampled Not located 20.5 -- 18.91 -- 15.2 -- 5.1 - 19.9 4 inches 237.30 237.91 Flush mount with traffic box
"low well yield" noted on
construction log
MW-7 NB-14 --
Located, well plug intact but
well box damaged and top
plugged with soil

24.8 -- 45.6 21.14 -- -- 3.9 - 24.0 4 inches 237.56 238.11 Flush mount with traffic box
"dry well" noted on construction
log
MW-8 NB-15 Sampled Located, sampled with grab
sample 25.5 -- 24.7 13.46 8.91 9.9 4.7 - 24.8 4 inches 236.01 236.62 Flush mount with traffic box
"dry well" noted on construction
log
MW-9 NB-13 Dry Located, well plug intact, dry
but moist at the bottom 25.6 -- 24.55 24.77 -- -- 4.7 - 24.8 4 inches 236.32 236.79 Flush mount with traffic box
"dry well" noted on construction
log
MW-10 -- Sampled
Located, well plug and cap
intact, sampled, recharged
after purging 6.5 gallons

39.0 -- 37.6 37.74 34.2 34.17 33.0 - 37.5 4 inches 236.80 237.00 Flush mount with traffic box --
MW-11 NB-22 Dry
Located, well plug intact and
cap intact, dry but moist at the
bottom

20.0 -- 40.05 40.27 -- -- 9.7 - 19.2 4 inches 237.58 238.00 Flush mount with traffic box Labeled as MW-16 on one map
MW-12 NB-27 Not located Not located 25.5 -- -- -- -- -- 9.1 - 24.6 4 inches 236.24 236.58 Flush mount with traffic box --
MW-13 NB-39 Not located Not located 41.0 -- -- -- -- -- 20.50 - 39.40 2 inches 238.04 238.34 Flush mount with traffic box --
MW-14 NB-38 Dry
Located, well plug and cap
intact, dry but moist at the
bottom

47.25 -- 21.85 45.74 -- -- 25.65 - 45.65 2 inches 237.57 237.89 Flush mount with traffic box --
MW-15 NB-40 Not located Not located 45.05 -- -- -- -- -- 26.30 - 45.05 2 inches 236.24 236.45 Flush mount with traffic box --
MW-16 NB-44 Dry Located , dry 45.57 -- 45.18 45.36 -- -- 25.47 - 45.09 2 inches 236.49 236.72 Flush mount with traffic box
Water Depth (feet bgs)
Well Name Notes
Screen
Interval (feet
bgs)
Well
diameter Surface cover
Well Head
Elevation2 at
installation
(feet above
msl)
Ground
Surface
Elevation at
installation
(feet above
msl)
Well Status Well Depth (feet bgs)
Boring
Name
Shallow Groundwater Monitoring Wells

Attachment B
Table 1
Onsite Well Construction Summary
SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
2003 2021
Well
Completion Log
(1988 - 1991)
Extraction Well
Permit
Application
(1992)
2003 2021 2003 2021
Water Depth (feet bgs)
Well Name Notes
Screen
Interval (feet
bgs)
Well
diameter Surface cover
Well Head
Elevation2 at
installation
(feet above
msl)
Ground
Surface
Elevation at
installation
(feet above
msl)
Well Status Well Depth (feet bgs)
Boring
Name
Shallow Groundwater Monitoring Wells
DMW-1 DMW-1 Abandoned NA 210 -- -- -- -- -- 188 - 208 4 inches 237.74 237.9 Flush mount with traffic box --
DMW-2 DMW-2 Sampled Located, well plug intact, dry
but moist at the bottom 208 -- 199 191.87 139.22 -- 179 - 199 4 inches 236.43 236.4 Flush mount with traffic box --
DMW-3 DMW-3 Sampled Not located 201.0 -- 200 -- 139 -- 180 - 200 4 inches 236.19 236.38 Flush mount with traffic box --
DMW-4 DMW-4 Sampled Located, dry 209.4 -- 207 204.33 141 -- 187 - 207 4 inches 238.21 238.44 Flush mount with traffic box --
DMW-51 -- Dry Located, dry but moist at the
bottom -- -- -- 200.63 -- -- -- 4 inches -- -- -- --
EX-1 -- -- -- -- 40 -- -- -- -- 10 - 40 4 inches -- -- -- -- EX-2 -- -- -- -- 40 -- -- -- -- 10 - 40 4 inches -- -- -- -- EX-3 -- -- -- -- 40 -- -- -- -- 10 - 40 4 inches -- -- -- -- EX-4 -- -- -- -- 40 -- -- -- -- 10 - 40 4 inches -- -- -- -- EX-5 -- -- -- -- 40 -- -- -- -- 10 - 40 4 inches -- -- -- -- Notes:
1 Well location found during 2021 investigation and not previously noted on other maps or reports. Noted as "DMW5?" for the purpose of the 2021 investigation 2 Well Head Elevation is presumed to be Top of Casing Elevation bgs - below ground surface
msl - mean sea level
Information gathered from the 2003 Everest Services, Inc. report, 2003 Third Quarter Report For Groundwater Monitoring Activities , the 2021 Analytical Consulting Group, Inc. report, Monitoring Well Investigation Report, Former Semco Twist Drill & Tool Company , and Well Completion Logs provided in Appendix A.

Deep Groundwater Monitoring Wells
Extraction Wells

Attachment B
Table 2
Historical Groundwater Elevation Data (Shallow/Perched Zone) SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
Well Name Casing Elevation
(feet amsl)
Well depth
(feet bwc) Date measured Depth to Water (feet
bwc)
Groundwater Elevation
(feet amsl)
Nov-88 9.37 227.07
Nov-89 10.33 226.11
Feb-90 9.64 226.80
Feb-90 8.57 227.87
Jun-90 10.24 226.20
Dec-98 -- --
Sep-03 11.15 227.34
Jun-21 10.90 227.59
Nov-88 9.84 226.33
Nov-89 11.56 224.61
Feb-90 8.55 227.62
Feb-90 6.71 229.46
Jun-90 9.56 226.61
Jul-94 18.16 218.01
Jul-95 7.00 229.17
Jun-96 9.71 226.46
Jan-97 7.70 228.47
Jun-97 10.70 225.47
Dec-97 10.77 225.40
Jul-98 6.78 229.39
Nov-98 -- --
Dec-98 6.78 229.39
Jul-99 9.97 226.20
Jan-00 10.30 225.87
Jul-00 10.94 225.23
Dec-00 13.55 222.62
Sep-03 19.99 218.44
Jun-21 Unable to open well --
Nov-88 11.56 226.00
Nov-89 12.56 225.00
Feb-90 11.52 226.04
Feb-90 10.62 226.94
Jun-90 11.94 225.62
Dec-98 14.07 223.49
Sep-03 -- --
Jun-21 Dry --
Nov-89 -- --
Feb-90 -- --
Feb-90 -- --
Jun-90 -- --
Dec-98 -- --
Sep-03 -- --
Jun-21 Dry --
Nov-89 -- --
Feb-90 -- --
Feb-90 -- --
Jun-90 -- --
Dec-98 12.88 224.92
Sep-03 9.00 231.03
Jun-21 Dry --
236.44 24.7
236.17 20.3
MW-1
MW-2
MW-3
MW-4
MW-5
237.56 22.2
236.09 30.4
237.80 29.0

Attachment B
Table 2
Historical Groundwater Elevation Data (Shallow/Perched Zone) SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
Well Name Casing Elevation
(feet amsl)
Well depth
(feet bwc) Date measured Depth to Water (feet
bwc)
Groundwater Elevation
(feet amsl)
Nov-89 15.20 222.10
Feb-90 12.60 224.70
Feb-90 10.52 226.78
Jun-90 9.11 228.19
Aug-94 11.23 226.07
Jun-95 11.32 225.98
Jun-96 13.02 224.28
Jan-97 7.69 229.61
Jun-97 13.30 224.00
Dec-97 9.21 228.09
Jul-98 7.89 229.41
Nov-98 13.96 223.34
Dec-98 10.90 226.40
Jul-99 12.51 224.79
Jan-00 12.38 224.92
Jul-00 13.01 224.29
Dec-00 14.29 223.01
Sep-03 15.20 224.34
Jun-21 Unable to locate --
Nov-89 -- --
Feb-90 -- --
Feb-90 -- --
Jun-90 -- --
Dec-98 -- --
Sep-03 -- --
Jun-21 Dry --
Nov-89 -- -
Feb-90 -- -
Feb-90 -- --
Jun-90 20.45 215.56
Aug-94 10.60 225.41
Jun-95 6.23 229.78
Jun-96 7.81 228.20
Jan-97 3.77 232.24
Jun-97 8.30 227.71
Dec-97 5.19 230.82
Jul-98 5.84 230.17
Nov-98 8.55 227.46
Dec-98 6.36 229.65
Jul-99 6.35 229.66
Jan-00 5.44 230.57
Jul-00 6.25 229.76
Dec-00 6.78 229.23
Sep-03 8.91 229.37
Jun-21 9.90 228.38
Nov-89 -- --
Feb-90 -- --
Feb-90 -- --
Jun-90 -- --
Dec-98 -- --
Sep-03 -- --
Jun-21 Dry --
236.32 24.6
237.56 24.01
236.01 24.72
MW-6
MW-7
MW-8
MW-9
237.30 18.9

Attachment B
Table 2
Historical Groundwater Elevation Data (Shallow/Perched Zone) SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
Well Name Casing Elevation
(feet amsl)
Well depth
(feet bwc) Date measured Depth to Water (feet
bwc)
Groundwater Elevation
(feet amsl)
Feb-90 34.46 202.34
Feb-90 34.31 202.49
Jun-90 34.28 202.52
Aug-94 33.96 202.84
Jun-95 33.47 203.33
Jun-96 33.95 202.85
Jan-97 34.19 202.61
Jun-97 34.03 202.77
Dec-97 34.41 202.39
Jul-98 33.30 203.50
Nov-98 34.10 202.70
Dec-98 34.18 202.62
Jul-99 33.97 202.83
Jan-00 34.25 202.55
Jul-00 33.87 202.93
Dec-00 34.21 202.59
Sep-03 34.20 204.89
Jun-21 34.17 204.92
Feb-90 16.45 221.13
Feb-90 9.71 227.87
Jun-90 11.66 225.92
Feb-90 16.45 221.13
Aug-94 12.39 225.19
Jun-95 9.75 227.83
Jun-96 11.26 226.32
Jan-97 7.71 229.87
Jun-97 12.00 225.58
Dec-97 9.35 228.23
Jul-98 8.68 228.90
Nov-98 13.48 224.10
Dec-98 9.80 227.78
Jul-99 11.02 226.56
Jan-00 11.99 225.59
Jul-00 11.74 225.84
Dec-00 13.73 223.85
Sep-03 -- --
Jun-21 Dry --

21.85 Sep-03 -- --

45.74 Jun-21 Dry --
Sep-03 -- --
Jun-21 Dry --
Notes:
1 Well depth reported at 45.6 feet in bws in 2003.
amsl - above mean sea level
bwc - below well casing
-- - Information not available
238.76 45.2
236.80 37.6
237.58 40.0
239.84
Historical data from 2003 Third Quarter Report For Groundwater Monitoring Activities at 2936 Industrial Parkway, APNs 111-291-027 & 028, Santa Maria, California , dated 24 February 2004 by Everest Services, Inc. and Monitoring Well Investigation Report, Former Semco Twist Drill & Tool Company, 2936 Industrial Parkway, Santa Maria, California , dated 16 July 2021 by Analytical Consulting Group, Inc.

MW-10
MW-11
MW-14
MW-16
2 Well depth reported at 13.46 feet in bwc in 2021.

Attachment B
Table 3
Proposed SVE Well Construction Details
SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
Well Screen
(Top)
Well Screen
(Bottom)
SVE-1 50 4 2 - 4 4 - 50 0.01 5 50
SVE-2 50 4 2 - 4 4 - 50 0.01 5 50
SVE-3 50 4 2 - 4 4 - 50 0.01 5 50
SVE-4 50 4 2 - 4 4 - 50 0.01 5 50
SVE-5 50 4 2 - 4 4 - 50 0.01 5 50
SVE-6 50 4 2 - 4 4 - 50 0.01 5 50
SVE-7 50 4 2 - 4 4 - 50 0.01 5 50
SVE-8 50 4 2 - 4 4 - 50 0.01 5 50
Notes:
bgs - below ground surface
ID - identification
SVE - soil vapor extraction
SVE wells will be installed up to a maximum total depth of 50 feet bgs and actual depths will be recorded during installation.

Screen Slot Size
(inch)
Approximate
Bentonite Seal
Interval
(feet bgs)
Well ID
Approximate Screened Interval
(feet bgs)Casing Diameter
(inches)
Maximum Total
Depth of Well
(feet bgs)
Approximate
Sand Pack
Interval
(feet bgs)

Attachment B
Table 4
Preliminary Estimated VOC Emissions
SEMCO, Santa Maria, California
Langan Project: 781016901
September 2025
Compound TCE cis-1,2-DCE trans-1,2-DCE Vinyl Chloride PCE 1,1-DCE Chloroform Benzene Maximum VOC Concentrations in Soil Gas (µg/m 3) 11,000,000 4,000,000 5,600 5.7 13,000 18,000 45 38 Maximum Volumetric Air Flow (ft3/min)1 1,000 1,000 1,000 1,000 1,000 1,000 1,000 1,000 Maximum Daily VOC Emissions (lbs/Day) 2 989 360 0.50 0.0005 1.17 1.62 0.0040 0.0034 Maximum Daily VOC Emissions (lbs/Year) 2 360,932 131,248 184 0.187 427 591 1.48 1.25 Maximum Daily VOC Emissions Total2 721,900 262,500 370 0.37 850 1,180 3.0 2.5 Notes:

COCs - contaminants of concern
DCE - dichloroethene
ESLs - environmental screening levels
TCE - trichloroethene
PCE - tetrachloroethene
ROI - radius of influence
VOC - volatile organic compound
ft3/min - cubic feet per minute
lbs - pounds
µg/m3 - micrograms per cubic meter
Example Calculations:

Maximum Daily Total VOC Emissions (lbs/Day) =
Maximum Daily Total VOC Emissions (lbs/Year) =
COCs Other VOCs detected above ESLs
1 1,000 ft3/min was selected as the maximum flow rate for the purposes of this preliminary estimate but the SVE system operation will be refined based on initial testing results. 2 Maximum VOC emissions calculation is based the operation of eight wells at a time running for 24 hours/day for a total of two years and does not account for reductions in contaminant concentrations during operation.

Calculations herein are preliminary based on historical sampling data and may not reflect actual SVE operating conditions. 11,000,000 𝜇𝑔
𝑚3 ×
1,000 𝑓𝑡3
𝑚𝑖𝑛 ×

0.0283 𝑚3
1 𝑓𝑡3 ×

2.205𝑒−9𝑙𝑏𝑠
1 𝜇𝑔 ×
60 𝑚𝑖𝑛
1 ℎ𝑜𝑢𝑟 ×
24 ℎ𝑜𝑢𝑟
1 𝑑𝑎𝑦 = 989 𝑙𝑏𝑠/𝑑𝑎𝑦
989 𝑙𝑏𝑠
𝑑𝑎𝑦 ×
365 𝑑𝑎𝑦𝑠
𝑦𝑒𝑎𝑟 = 360,932 𝑙𝑏𝑠/𝑦𝑒𝑎𝑟

Attachment B

FIGURES

Attachment B
SEMCO
Attachment B
SEMCO
Attachment B
SEMCO
Attachment B
SEMCO
Attachment B
SEMCO
Attachment B
SEMCO
Attachment B
8-inch borehole
Bottom of boring
Bottom of screen up to 50 feet bgs
4 inch diameter well screen: Sch 40
PVC flush threaded, 0.010-inch slots
#2/12 filter sand pack
1-2 feet Bentonite chip or pellets
seal, hydrated
Ground surfaceCover
Cement-bentonite grout (less than
2% bentonite)
4 inch Sch 40 PVC well casing
Up to
50 feet bgs
Up to
4 feet bgs
Interval Depth
Up to
2 feet bgs
Concrete (for well box)
Up to
5 feet bgs
1 foot
1-2 feet
Up to
45 feet
1 foot
Typical 4-inch Sch. 40 PVC
Extraction Well;
Above-Ground Completion
As Needed
To Submersible Pump
4-Inch Diameter Sch. 40
PVC or HDPE
Wellhead Fitting; Typical
4-Inch Diameter
Rubber
Well Seal
Access for water level meter
As Needed
Access for Tubing and Associated Power
Cords For Submersible Pump; Outlet/Tubing
Diameter 1-1/4"
As Needed
Groundwater Flow
To Holding Tank
Vapor Flow
Flow Measurement
Port - Min. 1/2" Diameter
Sample Port
1/4" Inner Diameter
Vacuum Gage (0-20" Hg)
Gate Valve To Fit
Diameter Of Vapor
Extraction Pipe
As Needed
Vapor Tight Reducer
Adjustable Vacuum
Relief Valve (0-20" Hg)
Sch. 40 PVC Or HDPE To Match
Diameter Of Vapor Extraction Hose
Drawing Title
Figure No.

Project No.

Date
Set Title
7/30/2025 WORKPLAN FOR

ONSITE SOIL VAPOR

EXTRACTION

WORKPLAN FOR

ONSITE SOIL VAPOR

EXTRACTION
Figure 7

SOIL VAPOR

EXTRACTION WELL

CONSTRUCTION AND

WELLHEAD DIAGRAM
781016901
7/30/2025

SOIL VAPOR

EXTRACTION SYSTEM

ABU DHABI ATHENS DOHA DUBAI LONDON PANAMA

NEW JERSEY NEW YORK CONNECTICUT PENNSYLVANIA WASHINGTON, DC VIRGINIA

WEST VIRGINIA OHIO FLORIDA TEXAS ARIZONA CALIFORNIA 135 MAIN STREET, SUITE 1500, SAN FRANCISCO, CA 94105
T:415 955 5200 F:415 955 5201 www.langan.com
Filename: \\langan.com\data\SBA\data9\781016901\Project Data\CAD_01\Environmental\781016901-N-SP0102_2025.dwg Date: 7/30/2025 Time: 14:47 User: azeng Style Table: Langan.ctb Layout: SVE Construction Diagram Date
Issuances
Description
Date
Revisions
Description
Attachment B

APPENDIX A

AVAILABLE WELL COMPLETION LOGS AND BORING LOGS

Attachment B
Attachment B
,,,, WESTEC Services, In c.

JOB NO . .38 0.S � 00 J

WELL CO MP LETION RECORD
. WELL NO. j rnw J HYDROGEOLOGIST .:r CJ-/ / C £.D I C:A A • CLI ENT .Jf n0 co DRILLER VA LlE.. '( WE.'- '- .5[, ll VIC,£ .

WELL LOCATION ______________ DATE/TIME 1 II) 0 / 8 8 @ 7: 4 $

GROUND SURFACE

DETAILS OF CONSTRUCTION
Date Comple ted __ u ..... 1/f_,_o_/_8_8 __ 9..._._· 5---'I;.....

C2 ,,
Borehole Diame ter (in .) ___ -=o'------
Type and Size of Casing (in .) PVC.. 2.
11 6C..rl 40
Type and Size of Screen (in.) RIC. 2 '' SC.J-1 40
Screen Perf oration Dia meter (in.) . 0 20 1A.J.

Screen Lengt h (ft.) __ 1 ___ 4_._;_�-----
Central ize r Dep ths (ft.) __ , __ , __ , __ ,
Comple tion Techni que:
1) Type of Filter Pack and Placement
= ro e.

Well Head Elevation ___ _
Ground Su rface Elev. ___ _
Well Head Completion Method
-n.tJf"/'IC, 601
Drillin g Method/Rig Type
am ge:x
Surf ace Casing: Type P,J C
Diameter IO ''
�, Length -�o __

MATERIALS
Method /
Cem ent (sks.) _____ _
[[,buTER..£'( =ti-.3 �A� 0 jnE:rn mi€..
2) Type of Bento nite and Placem ent
.AJ EIJ To/J ff£ C. I p
3) Type of Grout Mixture and Pl acement
Method
Description of Pote ntial Problems With Well:

CouL. D u� r b/L ou T
Develo pmen t Tech nique
)/4A.10 <µur'l�
GROUT

BENTONITE

FILTER PACK
\
,,
_, ,,
i
1 I
I
\
'
T
' '
7:�il' !!li�J5:
0 � -=.zo
H = -
Filter Pack Material (tt.3 ) __ _
Casing Material (ft. )
Bentonite (ft� )
Top of Ben ton ite Seal • 2 5
I
Top of Filter Pack 3. 2 S ft.

Top of Screen 5, z I
Bottom of Screen ZO
Bottom of Hole 20
ft.
ft.
ft.
ft.

NOTE: ALL DEPTHS ARE REFERENCED TO GROUND SURFACE
---------,
Attachment B
,,,,WESTEC Services, Inc. WELL COMPLE TION RECORD
Joe NO. 3 Bo si,, o c1 l WELL No . .smw .a HYDROGEOL OGIST J c.t1/ C.1!'.. D ) £A A CU.ENT ,OE:fYlC.() DR ILLER v')3LL£Y . JA1£LL . ;>e;(LV IC.£ WELL LOCATION DATE/fiME l 1 /JO / B 5 l O : 0 7 --------------

GROUND SURFACE

DETAILS OF CONSTRUCTION
Date ·com pleted 11/J O / 8 & . . ---.-----=---,- ,-----Borehole Diame ter (in.) --=8 _______ _ Type·and Size of Casing (in .) fvC. 2 ,, !JC..J-/ 4 0
Type and Size of Screen (in.) Pvc. 2. ,, jC..J-1 40
Screen Perforation Dia m eter (in.) . 02
Screen Length (ft.) __ .._2."'""0 _______ _
Central izer Depths (ft.) __ , __ - , __ , __ ,
Compl etion Technique:
1) Type of Filter Pack and Placement
Well Head Elevation ___ _
Ground Surface Elev. ___ _
Well Head Completion Method
VAF�IC. f3Cf1{
= Z ro& Drill ing Method/Rig Type
= TO F .....:,G,,.___E=D�R ..... E,.._;i'--------
Su rface Casing: Type Pv' C.

MATERIALS
lo ll Diameter
B l Length __ _
Method / ·
Cement (sks.) _____ _
��TE.� £., � 3 ;')�t,..J..Q/7R EJnf\'l /C:: . l
2) Type of Bentonite and Placement Method
AJ� Gairou 1TI.. /rl Aid D
3) Type of Grout Mixture and Placement
Method
Description of Potential Problems With Well:
�u� F'A(e, CA5oJ<.., JJ.c -r
GtC.. cu Te:D :J)oe:, n
Developmen t Techni que
1-I A A. ID r,Ju rn P
GROUT

BENTONITE

FILTER PACK
Filter Pack Material (tt.3 ) __ _
= eo �
Casing Material (ft.)
Bentonite (ft� )
Top of Bentonite Seal �. 0
Top of Filter Pack 3 . 2 ft.

Top of Screen ___ 5.......a,2=-__ tt.
= 2 � l!PH Bottom of Screen J 5. � ft.

Bottom of Hole a2 Ca ft. .
ft.

NOTE: ALL DEPTHS ARE REFERENCED TO GROUND SURFACE
Attachment B
,1/ I
WELL COM PLETION RECO�D .
"JOB NO. J 8 0 .S-(o 60 )
. CLIENT 6aYl C.O
WELL N0 . .5mw3 ' HYDROGEOLOGIST TC!-1 /CE..D!E..A A
DR ILLER ViJLLC( Nt:..J-L �a.. V JC.£
WELL LOCATION ___________________ DATE/TIME 11 /20 / 8 8 / I/: I /

GROUND SURFACE

DETAILS OF CONSTRUCTION
Date Completed 10 0 / 8 3
' el ,/
Borehole Diameter (in.) ......... a _____ _
Type and Size of Casing (in.) Ric. 2" !,C..H 40
Type and Size of Scr�en (in .) P/c. 2 '' SCH 40
Screen Perfo ration Dia m eter (in.} . • 02
Screen Lengt h (ft.} ___ / __ 5=-------
Centralizer De pths (ft.) __ ,_. _,_ ._, __ ,
Completion Technique:
1} Type of Filter Pack and Placement
Method
JnoAJ ra..E..r -Jk 3/"7et;:zr1.l(l1 � •
2) Type of Bentonite and. Placement Method
j.lo,.. ):) ant?JJ 1,E. /2-1 A A..l () ·
3) Type of Grout Mixture and Placement
Method
Descr iption of Potential Problems With Well :

Develo pment Techni que
GROUT

BENTONITE

FILTER PACK
-=., 4 = eo�
'e oi--1 -
Well Head Elevatiqn ___ ____
Ground Surf ace Elev. ___ _
Well Head Completion Method
ll.AF,t:1C 60 z(
Drilling Method/Rig Type
Ge:.o R0
Surfa ce Casing : Type P✓c..
lo ,, Diameter
B l Length __ _

MATERIALS
Cemen t (sks.) ________ _
Filter Pack M_atedal (tt.3 ) 4 ·
Casing Material (ft. ) · 2 4 .5
Bento.nite (ft� ) __ .__I __ _
Top of Ben ton ite Seal __ 3 __ ft.

Top of Filter Pack _ .... 5;;.___ft ..

Top of Screen 9. 5 ft.

Bottom of Screen � 4. 5 ft.

Bottom o f Hol e J}..q. ;, ft.

NOTE: ALL DEPTHS ARE REFERENCED TO GROUND SURFACE
Attachment B
'''' WESTEC Services, Inc.

FIELD LOG OF BOR ING
IBORING NUMBER 6 I 0

PROJECT NAME PROJECT NUMBER
I

ELEVATION ANO DATIJM
I

LOCAOON
br-.rY'\ C o 38 0!i(o oc J

DRILLING COMPANY DRUER
V .ALU:.Y JA.Je::.u... .!,�1... \/ ICL
D'/4;

DTIME STARTED

11. o·7a& ,� : I 8
DRILLING EQUIPMENT d
(;t::7") �.

SIZE AND TYPE OF BIT
,
8' ' Au6 d-

DRLLJNG
�
D
C kl€.

SAMPLE HAMMER
TYPE �--· ► ►
� ;
ffi
DEPTH
8 (FEET)
ca �
I J�
l
,1
3 q
s ""
'
X ,v
?
"
9 10
I I
' i
,,
12 1--:3
}4

DRILLING METHOD COMPLETION DEPTH
J-1� II� ,,...J '::,n:::.,.,...,_
tk)LE�
BULK ss NO. OF

SAMPLES
DRI.LIGr
WA1ER F1RST
LEVB.

DRIVING WT. } 40 I b DROP 30
JI .
�

DROGEOLOGIST / DATE
�a. ..
n
kAO
L.25
..30
""
?
8 JO
12 ,s

DESCRIPTION
/:j!Jc:. - m1:. D �r.1 .uD . T..ilJ -L r
�t f1 LA.J/J I n � 'r, mr-i) I Dn<.1.4, ,--
'i=bot(.L Y --"' t"'\ 0 ;-€ (') mo o l?ouAlD �D
(',.,"-- 172:l ,1Jtl'� �"-JiiA ;D A� u �
(], I 11 ,: f'i N 1T H A � P!-IAl 7 ?
.61 t .. :rY rnr-0 hAi\lD -r-AA..J -,
Lr. �ILJJ T').Arn p Ln n� £
�AL LD �: 1,,..J1; 1 /. m� D S�P.Tc.t')
m�D - ✓AJCLL 'Kon UOt:.-D .

F11Jc... - rnc:D. !,A,\.,lD
Lo o�F
t,_j I Tl--/
ma o- , ... 11="" 1 1
m, t,Jo/2 'ill I
mo,t, T
�n e..Tt:D
,

ESTIMATED
u, � PERCENT OF
�! en GR SA R
j/AJ 95 �
SrT'. 85 /=:)
�p 95 5
SHEET / OF 2_ - --
D��

TIME COMPLETED
'1 IO /S f:)
TOTAL NO. OF SAMPLES

DRIVE ' PITCHER
I AFTER -. _HOURS

CHECKED BY/ DATE

COMMENTS
;�:� S b JO - /
/-/.UL} -3..-, ntv1
1�:35 �J O -d
J z: 42 810- 3
}-/A} J /,., Oort\. , .
. i
Langan Note:

Sheet 2 missing
in 1989 Westec
Report
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
.,,., ERC
·I
� Environmental
and Energy
Services Co. WELL COMPLE TION RE COR D
Jos No. 3 e>o5 7 � oc- \ wELL No. lYd,o to
cuENT s GnJ ct)
wEL L LocAT1ON s·l,n-b f\\a �"1 P\.

GROUND SURFACE
, DETAILS OF CONSTRUCTION
Date Comp let_ed ----=·;L'--. ·_-...:..)_·-_ · e.-=-l -=O;..__ _ ____;_ Borehole Diame ter (in .) / � - / V\
Type and Size of Casing (in.) '-i -1� "Pv' C.

Type and Size of Screen (in .) &\ - Iv \ pv L
Screen Perfor ation Dia meter (in.) D ,_, O & 0
Screen Length (ft.) L./ � S --{! t
- C� ntralizer De pths (ft.) NA •-=-•-=-·=-•
Comple tio n Techni que:
1) Type of Filter Pack and Pla cement
Method
#1..I . . - ,
7i'Z.. Lt.Yl e 5 +av--. ) 7}-:c: W\Ml "< I
2) Type of Be ntonite and Pla ceme nt Method
t/r.J-iV\ fn v(�ot�, t� lJ<'�S ltre�wt-t.e I I 3) Type of Grout Mixture and Placemen t Method . . -<
Vo \11 laj � 1-w/ 5 %? p•v-.f la,.,( )r ir-r:,»�<
Description of Potential Problems With Well:

Develo pment Techni que
HYDROGEOLoG1sT (!., o\� "--c k �
DRIL LER Va lle;i i.VGI( 't>IM \ \,,a .)
DATE/TIME 'l,- l - '\ D (f:, I�� Q
i
\
,,
,,
';�
� ,
,_ , ,,
\
·W elL Head Elevation ___ _
Groun d Su rface Elev. _____ _
Well Head Co mple tion Method
-,..... i'/J . � I ra.. "t11 c be_,,,<
Drill ing Meth oi::J/Rig Type
· 6,ee,�r:e'h ·r-:x..� I �4A l,,.; :.-do-v\.

I II Surfa ce Casing : Type A/
Diam eter __ _
Length __ _

MATERIALS
Cemen t (sks .) 3 � le. � ,C!.c'(\.[V-C.. k
Filter Pack Material (ft.3 ) 3 5 l �
Casin g Mate rial (ft.) ·3 � --.ft-
, 3 .

Ben tonite (ft. ) J./ 2/cs
Top of Ben ton ite Sea� '2.. 7 .. 5 ft.

Top of Fi lter Pack 3 I. O ft.

Top of Screen 5 3.,. C. ft.

GROUT

BENTONITE

FILTER PACK
: �­�::�t[; !!li�i:r_ Bottom of Screen · 3 7. 5"' ft.

Bottom of Hole 3. e, . C ft.

NOTE: ALL DEPTHS ARE REFERENCED TO GROUND SURFACE
Attachment B
.,,.. . ERC
� Environmental
and Energy
Services Co. WELL COMPLE TION RECO RD
JOB NO. 3 &O 5 7 ..,de--( WELL NO. h1 W l \
CLI ENT · 5t=il'\. CO
WELL LOCATION ,Scl '1c J,a, r/)a r-ia,.

HYD ROGEO LOGIST e.: 'Di e,,i-ck_�
DR ILLER \J (1_ 11.PJ w d ( b 1:d ), � 7

GROUND SURFACE

DETAILS OF CONSTRUCTION
Date Comple ted 'l - 2. - Cf 0
Bor ehole Diame ter (in.) �le--'--_..l'-'-.V\....J...;... __ _ Type and Si ze of Casing (in.) '/-/ VI. PV·L
Type and Si ze of Scree n (in.) 4 ... 1� Pvc
Screen Perf oration Diame ter (in.) (d �crt C
Screen Length (ft.) q � 5 -+"f..

Cen tralizer Depths (ft.) li/1.�.:::__._:::_,
Comp letion Tech ni que:
1) Type of Filter Pack and Pl ?cement
Method
·#y,..,_ �eik I 'tt--e tl'l JK-t � . J
2) Type of Ben t nite and Pl aceme nt Method
Aia. IH-U, -� i\, - ,,, '-4,,", ·, -,..e 01. t11. "�
Descrip tion of Poten tial Problems With We I:

Develo pmen t Techni que
--�
GROUT

BENTONITE

FILTER PACK
DATE/TIME 2- 2-qo e_ t!J e, 15
.,, ·.:-
,[
�� ,, , ,•
- , - ,,
;f �'!i.: rtt:�i:r_
Well Head Elevation ___ _
Groun d Surf ace Ele v. ___ _
Well Head Comple tion Method
·1 r-�t �(. �(' . 13c.,t(
Drill i_np Meth od/Rig Type
;./0J k�U) 5,�C4\,\. /r;cc-1( ct:. r-s-(_�-
Surfa ce Casing : T/pe N-/t
Diame ter ---
Length __ _

MATERIAL S
Cemen t (sks .) 3 _jh, S '-c 'v1.l (,t•k
Filte r Pack Material (ft.3 ) $ks
Casing Material (ft. ) ZC '
Be ntonite (ft� ) '2 .. S [1,, :;
,)
Top of Ben ton ite Seat 3'"' . 0 ft.

Top of Filter Pack ? • ·'L_ ft.

Top of Screen cl • 7 ft.

Bottom of Screen 1 "/, l. ft.

Bottom of Hole 2.0 .. C · ft.

NOTE: ALL DEPTHS ARE REFERENCED TO GROUND SURFACE
Attachment B
.-. EAC
� Environmental
and �nergy
Services Co.
:>RING NUMBER A/ }31 2.
nJECTNAME
Si=mc o

FIELD LOG OF BORING

PROJECT NUMBER
I

ELEVATION AND DATUM
3CrCI S'"7. CrcT1
SHEET _/_OF _3:,_
I
LOCATION.
,. 2.P/3, rrJ"�I rd'tl U't2.l.

I
unlLr/{;/.,ANv . • ORiLLER DA TE ANO TIME STARTED DA TE AND TIME.COMPLETED 1ht -e� iJJe://7)i--,'//i1,,a . RtJt°n JJ'l- t:> dV\ '2- l ·- 't C 2- 1 --� (!) (i? J-"A� �UING ECiJIPMENT r 1l -_,, .P.n · w· I -5 CJ o

I SIZE AND TYPE OF BIT
8- ,·" t(..,l.l,.�
IIWNG· FLUID
I ndn e:

I SAMPLE HAMMER -·
f PE n, Cl J!l lhL, {
>
I §
u, w
0 DEPTH �
(FEET) 2 4
-I u,
I
I I
I

2. I 3
I
I '{
L
5 {p
I
7 I $
I C,
I
/0
JI
I
J 1..

I 13 -
'1
1·
I'{
> r:c w
8 w a:
-
./ DRIWNG METHOD
I
COMP LETI ON D�?H
J./nit�J1 s. em ·;z..o�
HOLE DIAMETER NO. OF BULK ss
e,- ,� SAMPLES .41 2.....

DRILLING ANGLE
¢' WATER FIRST ,
LEVEL ..... 2..c.9
,
DRIVING WT. 1tta .. /l, DROP 30-J k

HYDROGEO
;
OOtST/ DATE
tE t:> 1.-1 --q c
3: !:;
9:=J m 8

DES CRIPTION
B� ,t; It,. i,.,.it� c �U-'1! � �- -k,
, J ., ' ,,J � ;t!_ .. 't �d �U, IM, � v-tl,4 \1\<.£ C.ir,A� yV(,pj:,, �d4�·: �a;1,,/..d1,4 ud t�or- � ,,,/,
"
I -
✓-�
sa,1,t.,,e .a-4,....
,I rAA .ae!__ _
A L·;j �-1 _;
..I
r
dw1,'" �J.-
V
ESTIMATED ...
u, 0 PERC�T OF
� CD
:=J� u, GR SA R
rS? �" lO
Sf> q(!) (0
TOTAL NO. OF SAMPLES
4 DRIVE
!

PITCHER
IAFTER __ HOURS
CH
S�'� BY/��� ! ;:, , ..
. \ ! '
:- -;
' ; / ! _

COM MENTS
..
\
Attachment B
.,,._ ERC
..,,,. =, Environmental
and Energy
Services Co.
)BORING NUMBER /ti J3 2 2.._
> ►
§
(I) a: LLI
DEPTH -I > 0 CL
8 e (FEET) :::::::
cc w
...I (I) a:
== !z g::, m 8
J r1
3-Z. l� l/ c.fb
17 i&,
( c'
z..�
) 15
·z..' 2,
I/ 37
I-< /, �k � 'l- ·2.. .

I
2�
I
I
I
I
FIELD LOG OF BO RING _{CON TINUE D)
DESCRIPTION·
E,� ,-,1,-�h� �( tiudl ; ��-l-o
•. � l� 'k ]
,}\l\,e'�-P, 1,-t,llr\..-ec:R :5 PA d., (__--1,--,!.

Aa.��.
13 v-cr� . � L,,"' -eu s , 1-J.. 'k> j,,' l 4 el. 1.1
/, � U_ • '.j l, -� ,I ,. I _L,✓ ti,\ 1.rUJ,- ,/',Wi. ..;°y , .�,-:v-e,, {n n A-:-,-j, _

I ,V , -
i n[�u, _�:,,
' t ,,
Jh f' M . •1/rNI I\ I �1� � ,I-, ·;- �
J I
Wl-✓-rl .;' f �
.-

ESTIMATED
(I) 0 PERCENT OF
�m
::,� en .GR SA �
SL e/5 ,s
ML % �/4-
SHEET _&._OF�

COMMENTS
/1 ·5 0
JI 11 e
/
Attachment B
.,,._ ERC
..,,,,.. � Environmental
and Energy .

Services Co. · · WELL COMPLE TION RECO RD
WEL L NO. MUJ\L. HYD ROGEO LOGIST c�· b,-e" -c.lc.. 5
DR ILLER "'l ll-cj w c. {{ D ;,-; I/ ,,,(., cuE NT "'<s-Emc.o WELL LOCAT_ION Sc.in b'-Illa Na.

GROUND SURnACE
DETAILS OF CONSTRUCTION _
Date Comple ted ·7.-- '"2.. l - 'l O
Borehole Diame ter (in.) L 0 '- \�·- �
Type and Si ze of Cas ing (in.) �-, Y\ �VL
Type and Size of Screen (in .) 4 -, �- -Pv C
Screen Perfor ation Dia meter (in.) t) � c I 0
Scree n Length (ft.) J .5; '5 '·
Cen tralizer Depths (ft. )' ;YI/•-=-•-=-•-=-·
Comple tion Tech nique:
1) Type of Filter Pack and Placemen t
Method
'-;I:;= 2. J, .,_ L,,,.,. � -z �&iv: / T ,e '(V\ wi� < I I 2) Type of Ben tonite and Pla cement Method
:Ac, '111. e V\ .,.. r·rqv i u.7 C, kj? � /"Tr CrM\t.t�-·, J 3) Type of Grout Mixtur e and Pla cement
Method
\I c>l e: � ..., / 5% ? .:tt: -1-W /v-rr:mM<.'..e
Des cri ption of otentia l Problems With Well:

Developm ent Technique
GROUT

BE,NTONITE

FILTER PACK
'
)
)
DATE/flME Z -2 / - q C } I '-/ 5 7
,.
\
,3 .t
"
,_ , •' -,
!.' �
;;:::;L;�l:.:�J.

Well Hea d Elevation ___ _
Ground Sur face Ele v. ___ _
Well Head Com pletion Method
·r,-a ftt: c ;�-><
Drillin �. Met hod/Rig Type
}{� I !&4_;7 5 ?ei'-t. I 6c.-'C:·� C X 'T -5c..:rC:' r
• Sur face Casing: Type A/N
Diameter ---
Length __ _

MATERIALS , I
Cem ent (sks.) -2 5 /c ·> c t'y\_Cve ./..e.

Filter Pack Material (ft.3 ) q 7k: �.

Casin g Material (ft.) ·;z. 5 .. 5' ·
Be ntonite (ft�-) ·3 -:j le 5
Top of Benton ite Sea� ��..: C ft.

Top of Fi lter Pack 7 � 0 ft.

Top of Screen q • i ft.

Bottom of Screen :t '( .,.. C:. ft.

Bottom of Hole "L S: . .S ft.

NOTE: ALL DEPTHS ARE REFERENCED TO GROUND SURFACE
Attachment B
-.. ERC
� Environmental
and Energy
Services Co.
:>RING NUMBER
NB 1 7
KlJECTNAME
s1=rn co
ULLJNG EQUIPMENT ✓
,,,. .,, -
__,, --'� 1c.·f'v• I --5 � O

FIELD LOG OF BORING

PROJECT NUMBER
3oz:;5 7 �o o f

DRILLER /
!<tJltJ,°n

DRJLUNG METHOD /
Hn/t�, S t�m
I SHEET _OF __

I ELEVATJON AND DATIJM I LOCATJON /
:L&) 3'7 TrJt� f>4(/!U'r:ZL
DA TE AND TIME STARTED DA TE AND TIME.COMPLETED ..../

2. - 2. I ·- ct. e, e Jo :, � 2 - � I - '1-c::.i e.. I 1 3e,

COMPLE TION DEPTH
�s
TOTAL NO. OF SAMP�
�
I SIZE AND T'!PE OF BIT
£3- I""- a��

HOLE DIAMETER
8 -, �
NO. OF

SAMPLES
BULK ss
"i

DRIVE I PITCHER
In.LING FLUID DRILLJNG ANGLE
¢' WATER
LEVEL
FIRST
/" ZS
IAFTER __ HOURS

I SAMPLE HAMMER
rPE rJ, OM uui DRIVING WT.
, HYDROGEOLOGIST/ OATE Clj�CK� BY/ DA� /
I
0 E ..J
I
u,
DEPTH ..J Cl.
(FEET)
(/)
DROP 3D-J k

DESCRIP TION
CG' D / :2.- '2. /. - ei ,!)

ESTIMATED
u, o PERCENT OF
fA Cl i---------◄
::I�
u, GR SA R
J .. H '"}; /: ;--7r_·.

COMME NTS
f- -+---+--+----+-----------------+---+--�-+-----+------------1 L� l+- 1:;� ..,'\. � �--b ""'4i1 �1AA- �? �0 IC

2. ---i---4--1---i,,...;.,�l-,.:l"��- �i...:.:11\..::;,.;-e..==::.,-'IIQ..._,.:::;;:SVII=:;,,:.· "'-��.:=..,�•we.�l..L..'I_- ..:,..::;,I· /l,i;,.:,,.,,.,,_.:..,:k=c.�f'----_l--....---4--�4--------� "Jl.-�.I) , <JIIJI _J'-/j • M1 �L-L- � , .... i tilu1, , , I I 3- -+-----+---+-----------------+-----+--+----+---+----------t l( --+---+--+---+-----------------+---+--+---+---+--'---------t LD I/ " " -./
7--+--t---+---+-----------------+---+---+---+---+-----------t f;J---t---t--t-----+------------------+---+----+--+--+------------1 q --t---t--+---+-----------------+----+--+----+---+----------t ,o --1---+--,-+--+------------:-----:-----1--+---+--+--+--=-itJ�5�0:;;._ ____ � / i.C \3� - C..-:1�A-,o � A;L�� ):--1�.� jj> q.5 � /VG� -;,· -"L JI
J� --t--+--+--+-----------------+---+--+---1----+----------� 13 --+--+-----+--+----------------+----+--+----+-+----------t I � --+--+---+--+----------------1---+---+--+-+----------t J
(MW-12)
Attachment B
� ERC
� Environmental
and Energy ·
Services Co.

JBORING NUMBER JY'f32 7
> u, re 8 w w --' DEP TH ....
8 0 a.

E (FEET) . ::::e
ct w .... CJ) a:
l(;
- .
/7 ,1
ff,,
I '7

2.0 ·z. ; l'X V
I
.

I
I
I
I
== �
g=> m8
1' 7
113
14'7
,.,

3.b
48 ..

FIELD LOG OF BO RING _(CON TINU ED)"

DESCRIPTION
. [Z, ;r,f\, I l!iAL IJ l,,�J
C3v- h. , c\ti �r� 4.,,.� ,.p l�hA 4,,br_NJJ -
" . . �.L - � �vv:l,R_ :;- - ) f "' . - --111-ti. , �.c1 . / �- (/) 0 � m
::)� m
f.J"P
45G
1�
�J.�k nL1-�-kc.d�., /;,.,,.;k-/" g-"1 �ol

I I I I ,J
1s ol-l

ESTIMATED

PERCENT OF
'GR SA Fl
�s s
laa 'le
-
SHEET _i.OF '-

COM MENTS
/I O l(
Ni3--Z 7- 3>
It is
·f\l' rt..'1. / ,- lf
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
Attachment B
t
�E RCE WELL COMPLE TION RECORD
JOB NO. ·:, O'l. 73 .0 0' WELL No. l>M W3 HYDROGEOLOGIST CE b awd .sl- b cuE NT .SE/ '1 to DRIL LER La.-3>1 <- ·E11J vr�'t.211mexki wELL LocAT10N 2..q 3, :r:�"--sil·;et..,.( ·pk_:J DATE/TIME s/e/c,1 @o ei/ D

GROUND SURFACE

DETAILS OF CONSTRUCTION
Date Comple ted 3 - 9 -q /
Borehole Dia meter (in.) IC) -J&i\
Type and Size of Casing (in.) 4-1� LC. S 1"
Type and Size of Screen (in.) 'I '"'IM � S, 'ii
Screen Perf oration Dia meter (in.) o.c,·-l.D �,"'
Screen Length (ft.) 2. 0, 0 � f
Cen tralizer Depths (ft.) .NJi.�.�.-=._.

Completion Technique:
1) Type of Filter Pack and Placement
Method
Lhl, t!, I-a. v: :tt-3 / TtYrVL ,'-£. l 2 -r e of Bentonite ana P od '� _;_--=-�=-1---!.---=�UJ.'4-�� '�
Method
,Mel� � + IT.-�ie. p.s:,1.s
Descrip tio�f Potential f4;,;ems With Well:

IJ_,::,/e-, '
� i.. c. "51 = Lt::JW Ca-... l, .. 'V\, � 4-t!� (
4,t., 6S = Sfain /44,, .sl,:-ef
Devel opm ent Technique
.s:"' bM.e""� ; ht:< 'Pu.1114 ·
GROUT

BENTON ITE

FILTER PACK
Well Head Elevation ___ _
Ground Su rface Elev. _____ _
Well Head Completion Method
"Tra� C. aux -. f/u.,i Jl'ttf.ul, 1-
Drillin g Met hod/Rig Type
( 1::,ua,,I Tu,h.e._ /1:>M l .�.j,ifr:'M S
Su rface Casing: Type )//1.

Diameter __ _
Length __ _

MATERIAL S
Cemen t (sks .) ?> :sic �
Filter Pack Material (tt.3 ) 'l sk,s
Casing Material (ft.) '2.l!JO--f! f
Bentonite (ft� ) 3 AiLc!.k 'f?f::.

I h 7. 0 Top of Ben tonite Seat J '{, 7. Ott.
j? 3, 6 T / 7 2 I · op of Filter Pack �. t:) ft .
. Top of Screen /�rO ft.

Bottom of Screen 1.,o&.Ott . .
-Bottom of Hole 2� 1, 0 f t.

NOTE: ALL DEPTHS AREREFERENCED TO GROUND SURFACE
Attachment B
--
I ,
�E RCE
'BORING NUMBER
b MW 3

FJELD LOG OF BORING
SHEET ' OF b - --

PROJECT NAME PROJECT NUMBER
I
!3.EVATJON AND DAllJM
I

LOCATION
_S E)i tD ·i O '2. 7 ''3 • 0 0. t 2-C/ �' :XNiu.t,,fMd.,( p�"

ORILUNG COMPANY DATE AND TIME STARTED
l.a14 n.� t,,,, ,;,' �IJV'l �e'H. -k(
DRILLER f'€ s \I' � 3-7 -'II Q 11 30
DRILJ.Joo E\UIPMENT
't::> -n l �..t.; +�rK.-s

SIZE AND TYPE OP'BIT
I o-ik. C 'r8U v.L ._ IV\

DRILLING FLUID
N�-e

SAMPLE HAMMER
TYPE n"+uma.�"
>-
8 en a:
� w
..J DEPTH > 0 a.
8 s (FEET) :E
< w u, a:
--
--- --

2..
\
"
G.
8 iO
,2.
''l
'"
Ji

2..0
:Ll.

12.</
"2.'
�8
DRILLING METHOD l
bw..e.. ( Wa.. L
COMPLETI ON oei+
1� 1
HOLE DIAMETER NO. OF BULK ss
'-/ s; + "'- IV\ SAMPLES
-
DRILLING ANGLE ,s WA'TER FIRST
LEVEL
1 L/eJ-/k

I HYDROGEOLOGIST/ DATE
DRIVING WT. DROP 3t::)-� � CE't>I 6L. b

ESTIMATED
§�
..J 0 mu

DESCRIPTION
�\,-A.\\. .Q.\�-l-- 4-e "Md� LJ,M-a ra.111\.-tJ
1::...-:i "'/':.l _ �/1.\-e_ \i)...-.n, • V\ '\" � . (. .1.�\ -::� 6� I - '
.C.('9'½.P' /Yl,_;_�7 f- * )/,dfttt/) I
1-
Slt vu .. e- , ,t_...::., n l,..,,.,1 u-;, c'.-i. 0-i.·./-- k. +k ,�\ r,\ 1Lu ec.,; \ ,J ·"' /7.1,-'? ( se\ .
�J .J ,J .,
St.1 »t..-t::'... h?.L I (;t, + 2 ..(..J_,.,i:;+
C\ 11"' PLl , ll -, � , ,. . 1
✓.�H . �v\ J' --� · - • ..,.-gJ V\ t'�k' �t, 1(\t ,t
"' -"' ,....\" ;r,')-(1 \l\ \uL�e'N-ct.-� e ll/:::;1.1-·kcf �t.,t. rltf) J c. r-a,,+ e (, . L�..:.:P "'
,
-J
.=,avw ( II S {t...+ \:A -$+-
A) ier n tt -½ �v"' , . . \ Uu �U r��lA.¥ --le '""i,,\i; ,,,_ ,. ' ,, ',.,/ . ::�_J1, •, � .. � nt11.1 re f 44'Vl..£ii; cu .. �· - �)11\. r- .. .,�,f-11.L;,.1,1. ·· \J I "
J_ .c/1 ra, 11.. c - i � 1.11.t i1�-'7 t' (971/ � . ,., � l\\.�,elU �lA,--h ; (•,c9('t v�t,"- •� ,"t'.i l� e',..C �;C(,1,.(L_(!_ . ... PER�ENTOF u, 0 � m
:::,� en GR SA Fl
.
9 c, 1W 0
_1? 0 �,-5 5
% _,;/}1 0 � 5c
:t;-p D � C:5" 5
;¼ D ".5C .;',:,·
.,:»"
1P 0 la:> 0

DATE AND TIME COMPLETED
�- 7-tt l @ 17 30
TOTAL NO. OF S,AMPLES
3/

DRIVE '
PITCH� -
,AFTER __ -_HOURS

CHECKED BY/ DATE

COMME NTS
C ',.f- I i , j l 7r---, 'If)
- 2� l,:1 k,
3:w:1- ilv, Jr..
;;-_-2; 7
l! 'iL
. 11-� D
Attachment B
(.

I I
I :

I I
i
I I
i I
i
i,
� ERC
� � Environmental
and Energy
Services Co.

I
BORING NUMBER t> i"l bl .3
> �
§ m LLI
DEP TH _,
8 CL.
e (FEET) :::E
c( LLI
_, (I) a:
3'2..
3i
'3 (:..
3S i?' -.
�D
. /
CL ·
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:-, ti
io
,�y � I/' .... "i.
j ' I I "'"
t\\L
/ 1· 1 '-'& c '-
Vi '18 � c½'
/ /

FIELD LOG OF BOR ING (CONT INU ED)
=== !i 9� m 8
n -�c
32 '7
:.LC::.,
30 ' •
I O
l.C
'l.ii.t

DESCRIPTION
Ttl\��t·u,u -� ��-4' -� - � ���" & �,t1'ttk'...
"'?,a.,\� ��-..... - L_�l\ -,s1.;:-�A. l�.
lw\.�5 +-
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,� �: \ t1 0\LLu cu/ 1tt1�v,,-. .., tH\�1 1'\,\.Citl..e,Q \'\w-•"l :.� r·J �h l . .is i 4-,· ·-& r.w.., - · , ;-u..,_�- �";,i,._, n /'L.:. c:,' 1 )\\_ Ni ·V'tJ-a_ ..\. e.l\., .0 � r vv\.
1 ru ..... {.. - Sd't \/\ ,:,,_
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.
,1
c:,\ {i¼ € 1.-j sav\.cl
,J '�
C.,\� t� . c:..: t .l n4� kll�· .k {_,,✓-1J1l ..e.. ·v .i\ J I 1"..-11 t� , -� ,n:: U,.''f''\..
;J r
A/ t"� ,4-,,,, :.. \.P.+
M.iL•-Vr,· )( ,� /l_
r-,�,.,.._.._\u �,,r l-eJ ...

I \ � .J l
\J\I\ ' ,I\ /.V- """- "\I\.� , :•
CL
St.1V\J !l ,. \tt..; cc,,, , �: LL., ,.;.. ra"'·-<,.\1 "lt.!N'" .\ '1 �o/t--� � ..... ,_._...._ ,... .. ..
- , _J "T
I )'\1..c;.,, '7 i:-. '--A�_1 >•� ;_
\ �- ..-..) �
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!-ho-� {) � 1, t:.-o lo � l <- .... -s c.-v\. c::: c,.. \al. Je,1 . '( �. 1,::l --c.· \1'1.\,1.(_&, .'
1 -c-i'V\ /l \ � ; 1 .:,·t-L:'•A (' . I'�\ fl _.t:f.
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\='£t..-\.. e. \ �
r
- �-, ,,L'-l.
1 ,L2.-; � · '--
1 N� --- ...., I
.. 'f:--r.L-A ,.....;.,,
l,;, J
ESTIMATED .... PERCa.lTOF U> 0
� ID
��
U) .GR SA R
S? 0 IC't) 0
5? 0 '16
� 0 1 0 efo
:j(._ C> f:,c, �D
Ge ;.; lo �o
(,;rt) 50 ·7.· ,� % (
'I-
b\L 25 2,S �o
10;?� 5 LC I;.• . L,•.>
t!N
SHEET �OF�

COMM ENTS
-� iv\ \A] '?, ·- l
J --2 •. 6-5
-� � t.t = Tr /)i,yy\.
. l I
,-L s. � = o fl lrfY\. ''
'e> ivt W'?, · 1-
} i. 1-,.-5'
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\·1-3.5
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.
" Ji .:,S.; ,:;; C i'.'�•"'
I
\�05
..

Attachment B
I
,
I ,
I
� ERC
� Environmental
and Energy
Services Co.
'BORING NUMBER t> M h/3
> >
§
u, a: w w
DEPTH it 8 (FEET) ::::2
ui w � a:
✓)
✓
-/ / ,.·
// _//
/
J 72
c.� .. I
.//
�//
.7 '1
.,,
78 e,o "'

82...
e'I
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el
l> :/ �

92. t:t'I
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----------
:t!z 9::, m 8
7, le..
-,..'1
�\
41 40..
-
Jt:;
t.C:
;:.:,,,
FIELD LOG OF BO RING _( CON TINUE D)

DESCRIPTION
r· .L t,u .... � ;.,�t,. .,.\-,; Y\L�-J�-.JYJ..+cl\,, �LL-'.7�' ,-..1 ) ·,J I
-
t. \au -eu ,-t ·..-r:t..� � . �J ,k1 ',J � i- ,\A, ·, £1 \i-tt . Lu--�� {1_. .,, c.l �--"'1 �/ ;'\ �, V'-'-�-,(_ 1 ;
J
". L + �l,•-"�l. c,l.t-1 - c, \ u.t, lvi ({ �
·,�tl·c-te-hk. '1 \� k. -� e tA. ��l e.1 £t'.. t-c, 1/"kdi ✓
J./o i< e e-o v-e""1
-
l'i\ek1.u_y)l- �r-r--a.1� c�Q !::>av,,:l\,\ tfr-et..� Q (�:k> �-'bl�) , n'l,� t-r ..,, l+-:
-.J
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,
.
'J .( ,J il-1"' t:t &1 �"--t't c..U'.',. - 1146
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--
l J- /.-�ii
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No Re c.o v..e....,, ....

SltV1...�t,4 fi \/-{l e..�' .. ( l,u / i i;Ue;J' L?.Ai/ � , •·,J
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._µ,� -I'_ -✓-A r-CtJ i,i,-c;, J/_ +.mt tj �L1
•.J
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--J
ESTIMATED ... PERCENTOF u, 0
�!
u, GR SA �
t'W
,;(,
GV ,� �.5 0
GU) &5 'Is s
;j)- 30 "it, 0
c-.M 70 w I D.
�-·
Sul 55 'IS 0
SHEEr_A_ OF�

COMMEN TS
'b i.t Ll- l +L. ... �\C rvL�l;..(, {
�-;) i01
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\ ;ll1 ,--. LC:.. 1 :v1 ..:::,
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I
't, jvt l,t,'' 3 - l/
14 LO
i-lJ1 � :::: C .)..>»"-A} ,£ I I
f) ,_,,//�l.7//d�- e.

Attachment B
� ERC
� Environmental
and Energy
Services Co.
'BORING NUMBER t> M \v
3 > re § m w
DEPTH � 8 (FEET) == -c � .... en
,, 7.
""
11 '1 ., '"/ ,... .,.
�(' �/ ,, /;:: �/
118
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h .. 2.
/1...'(
11 .. '1
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13 0
13 2.
1 3'{
13 6
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SHEET i../ OF�

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Attachment B
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'BORING NUMBER D M 'W -s
>- >-
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DEPTH ... 8 0 �
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{FEET)
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158
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FIELD LOG OF BO RING (CONT INUE D)
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COMMENTS
.

Attachment B
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� Environmental
and Energy
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IBORING NUMBER D ,"-I w 3
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w
DEPTH
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FIELP LOG OF BOR ING _(CONTINUED)
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DESCRIPTION
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Attachment B
�E RCE WELL COMPL ETION REC ORD
JOB NO. ':>0 173 & 00 i
cuENT :s/E Me o
WELL NO. J>jv) W '/HYDROGEOLOGIST f!e O av;uf �i..., b
WELL LOCATION 2'13-b �U5 fuaf 1"?/rJ

GROUND SURFACE

DETAILS OF CONSTRUCTION
Date Comple ted ---''3=---_'l ___ -_q_l ___ _
Borehole Diame ter (in.) l 0-, �
Type and Size of Casing (in .) '-1 ... ,� . LC S
A
Type and Size of Screen (in.) Lf- i� 6� "1
Screen Perf oration Diame ter (in.) D.o'lO -J v..

Screen Length (ft.) 1. o,c-#�
Centralizer Depths (ft.) AlA.._,_:_,-=-.--=-•
Completio n Tech nique :
1) Type of Filter Pack and Placement
Method
L 0'\C:'> 1-a \- :il:3 f trt!M, .. :f
2) Type of Benton ite�nd Placement Method
i/'t-i\.\ \Jo iela. T&t.� l--e ·
3) Type of Grout Mixture an
Method
V cl e\aj 6!'.RY-± } T .-,:,,.,,; � {7-!. 4:J,;)
Description of Potentiat'Pr oblems With Well:

Ne+-4
� -Le..,... _ _ :S_= __
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-=--
. _"-'_Ca_v-....,..�-,:w,-6-+-c:_r:_I_ re � � :S = � 4-a,�I� :, t-t:-e l Develo pmen t Technique
..s '" b ""t:v:12·, b 1-e P le m. f .

DRIL LER L a.j n <: Lmti r-,,,,m ev,, Jd
DATE/TIME 3f e;/ ct1 @ oq 15 ·
, i
,, ,: 1
I
'
= i' 78,S
= 18 5".0
= ifJ'l .. O
Well Head Elevation ___ _
Ground Su rface Elev .. ___ _
Well Head Completion Method
7raB'ic 130,(
Drilling Met hod/Rig Type
Diameter __ _
Length __ _

MATERIALS
�eFAent (sks.) 3 5k"':,
Filter Pack Material (ft.3 ) 'l S /c S
Casing Material (ft.) ·J... I 0
Bentonite (ft� ) ·41 ba ckcb
Top of Ben tonite Sear i/8.,.:S' ft.

Top of Filter Pack iSS. 0 ft.

Top of Screen i 8 h O .f t.

GROUT

BENTON ITE

FILTER PACK
;;.:�:r.i?�l��i:, Bottom of Screen J..C 7. t:> ft.

Bottom of Hole 1.�et� ., · ft.

NOTE: ALL DEPTHS ARE REFERENCED TO GROUND SURFACE
:. ,· · .
'•
Attachment B
r 1 '� ERCE
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BORING NUMBER .t> 1'1 'W j

PROJECT NAME

FIELD LOG OF BOR ING
SHEET _J OF ---12._

PROJECT NUMBER
Sc,A,f t: D ·:; 0 2. 7 3 , C o J I

ELEV A TION AND DATUM
I

LOCATION
i.q ··; � I,�u;h"t �( ·pk�
/ I

DRILLING COMPANY
�Lij t1.<: e,;1 ,l;l/'"b,'\ i"ett. Ja.(
DRILLER + ·
!> -ev ,e_
DATE �D TIME
rAR_TED
•·3 ·- B ·-q I J 300

DATE AND TIME
;°
MPLfilED_ ·3 ,.q ·-9 ( o'J • o
DRIU� E\UIPMENT
·t;>...; l �"'� +�..--,i.�-s
SIZE AND TYPE OF"BIT
10 -i"" C V'c>c.J �,.,.L � I�

DRILLING FLUID
NM,e

SAMPLE HAMMER
TYPE /ti.(.. �:J.i_·t,
>
§
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HOLE DIAMETER BULK ss DRIVE NO. OF
lprr�
5; + IC)- ,� SAMPLES - � -·
DRILLING ANGLE ¢
,
WATER
LEVEL
FIRST
' ( � �,
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DES CRIP TION
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Attachment B
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and Energy
Services Co.

I
BORING NUMBER 't:> M w "
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DEPTH -'
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FIELD LOG OF BOR ING (CO NTI NU ED)

DESCRIPTION

ESTIMATED
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SHEET ·Z, OF�

COMMEN TS
·- ··· -----
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IBORING NUMBER 'bM hi Jj
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FIELD LOG OF BO RING {CON TINU ED)

DESC RIPTION
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BORING NUMBER 'C) ./YI \v �
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FIELD LOG OF BO RING _(CONT INUE D)

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Attachment B

APPENDIX B

HISTORICAL SUBSURFACE PROFILES (BY OTHERS)

Attachment B
Attachment B
Attachment B
Attachment B
:":;�j{
•:, -;• ,· -. . ·,. ,. /· ;.·'; ;}:? . ,.

BLDG
r
LEGEND
■ SMW-2 = Monitor Well Location and Number
.B9 = Soil Boring Location and Number
• A--A' = Line of Cross Section
... �
,,� WESTEC Services. Inc.

D
i

SUMP/PIT
- '

CONCRETE
PAD
SMW-3
:
8 810;
B�
---- • :::t: B8
A
SMW-1 -
B7 B-6 -
B-5

DRIVE WAY A/C

SEMCOBLDG
Locations of Soll Borings, Monitor Wells, and Cross-Sections ;

BRICK WALL
.. .

B'
• • B3
B4
..

ITANK
PAO
A' SMW-2 - -
ll�/ B2 B1
.. ..

SOLVEITT;
TANKSj
-
GATE
-
�
0 20
FEET
FIGURE
4-41
I
4-2
Attachment B
A
SP SP
5 ....... _ ....

SP
Lt. Brown Clean,
Well Sorted
Medium-Grained Sand
SP
5--■t■■--t
SP
••• • · Clayey • ····· ·· ··· ···
82 1· SC Med.-Gr. Sand 1 :
�-- ··· ·· ·· ··· ··
5--,..--.

SP
A'
81 s---
SP
10-+- --• ...... -----�=------1 0-+- --+-..,,,,-----------10 ------+i�-------Sltty Med. • • SP 10 ..,,,, --4---��-----------�c 10 ---+---■t----
SC Grained Sand • • • • / --········ ····· · /
/ / /
15 --- 15 -1--� / / /
15-+- -""'1
LEGEND
SM = Silty Sand
SP = Well Sorted Sand
SW Poo rly Sorted Sand
= Lithologic Contact
...1_ : =i Approximate Water
Table Location,
,,,, WESTEC Services. Inc.

SP
/ /
BlOO
SM
/
Cross-Section Location;
B7
COHCRETe
PAD
B
�
B6

DRIVE WAY AIC
SEMCO BU><I/
SMW-3
BB
SMW-1
B5
Cross-Section A-A'
., ' SP SP
', '
'1 5 15 ---t----t
SM
Tan, Silty, Medium-Grained Sand SM
25-t---1
SW
B'
B3
B4
30--,..--1
SW
35 CATE
- �
J..

HORIZONTAL SCALE
0 10
FEET
I
FIGURE
4-2
4-3
Attachment B
I
SP/SW
10-+- -------t
Tan, Poorly
Sorted Sand
SP SP
Tan, Well :3oned /
�
,,,,,,,
B'
,,_..,,,,,- SM
_,,,,. - 5 .....,_.... Medium-Grained Sand 5 -+----1 / 5-+---1 ti" SM ', SP /
/ ', // / ' .,"'
,' ......... .... .... .... .... I � _,,,,...,,,,,-10 ..._ -- -10-+- -...... - -- SM
SW 1--------------------i T
LEGEND
SM = Silty Sand
SP = Well Sorted Sand
SW = Poorly Sorted Sand
SP/SW = Mode rately Well Sorted Sand
---- = Lithologic Contact
__L_ = Approximate Water Table Location
,,,, WESTEC Services. Inc.

I
I
I
BU>O
15 --+----4
SM
□g
Tan, Silty, Medium-Grained Sand
15 --- 15 ""'f---t
SM SM
Cross-Section Location)
\

CONCRETE
PAD
I
SMW-3
- .

B
a-;-____ B'
; ---...._. • B3
� B8 B4
� iii IT-A PAD - �MW-1
A' S"'t-'·2 87 BG BS 132
' B-1

DRIVEWAY NC

SEMCO BLDO
Cross-Section B-B'
4-4
HORIZONTAL SCALE\
0 10
�. =--�-z=-.s �
FEET
FIGURE
I 4 .. 3
Attachment B

GOLF COURSE

I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I ®NB 9

I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I

PARKING LOT
� ERC
.... � Environmental
and Energy
Services Co.
®N B17
NB22 �
(MW11)
NB 12
� (MW6)
3 Mw1 · .. ·. ·.
@ NB1
l-r-7""""7'--,-....,.......,.--r-,-..,......-:,� ...-""'7"1 �

LANDSCAPED
AREA

INDUSTRIAL PARKWAY
NB 15
(MWS) @ NB19
Cross-Section Location Map
0 e·
• NBS
NB7
(MW5)
FEET
100

OLD FOUNDATION
WELL 2AS
LEGEND
� MONITOR WELL LOCATION
@ BORING LOCATION
- CROSS-SECTION TRANSECT
FIGURE
___________ __;_ _______________________________ _ @]
Attachment B
� I
A
WEST
0- NB6 NB13 D8 1

SP SP/SM SP

SP/SM SP/SC SP

SM SP/SM SP/SC
20 - SC/SM SP SP
i=' SP SP/SM SP w ..
w SP u. . - SP
s
w SP
40 - ML u.
::J en SP
Cl SM/ML
::J GC
GC
3: 60 - SW/GW
SW/SP w
J: SP
SP Cl
80 - SW/SP
SW/SP
••
10 0-
NB 1 1 NB10
l sp SP

SP/SC SC

SP/SM SM/ML
SM . SM/SP
SP SP

SP/SM SP

SP SP/SM

SM SM SP
CUML • ---- ML
Iii Iii
A'
EAST
NB16
SP
SP
ML SM
SM
SM
SP/SM
SP
SP
SC
CL SC
ML
ML
ML ..

GROUND SURFACE

TAN TO LIGHT BROWN ,

SILTY AND CLEAN

FINE -TO-MEDIU M-GRAINE D SANDS

BROWN TO TAN SILT, CLAYEY SILT,

SIL TY CLAY, CLAYEY GRAVEL,

AND SANDY SILT

WELL-TO POORLY-SORTED

FINE -TO COARSE-GRAINED SANDS

WITH MIN OR GRAVEL
LEGEND
ML = UN IFIED SOIL

CLASS IFICATION
SYSTEM

CLASSI FICATION
HORIZONTAL SCALE: 1" = 10 0'
,,,.,,,. ERC . F I G U R E
-�-
�
--
E
-
nv
_
i
_
ro
_
n
_
m
_
e
_
n
_
ta
_
l
_________________ C_ro_ss-_Sec_t_ io_n_A_-A_' __________________ ·@J-s and Energy
Services Co.

Attachment B
(la
B
WEST
0-
20 -
w w
z
w
40 -
Cl
z
0 :i: 60 -
0 w
Cl
80 -
10 0-
� ERC
-.. �- Environmental
and Energy
Services Co.

NB20
SP
SP
SC ML SP SP ML - ..

D82
SP
SM
SM/SC
SM
SP
SP/SC
ML
ML SM
SM CL

ML CL CL ML
SW/SP
SW
GP
SP
NB7
SM
SM
SC/CL
SP. --
e·
EAST
NB S
SP
SM/SP
SP
SP
SP
--
SP 5l.__
SW
SP
SW
SP . -
Cross-Section B - B'

GROUND SURFACE

TAN TO LIGHT BROWN ,

SI L TY AND CLEAN

FIN E-TO-M EDI UM-GRAINED SAN DS

BROWN TO TAN SILT, CLAYEY SI LT,

SIL TY CLAY, CLAVEY GRAVEL,
- AND SAN DY SILT

WELL-TO POORLY-SORTED

FIN E-TO COARS E-GRAINED SAN DS

WITH MI NOR GRAVEL
LEGEND
ML = UN IFIED SOIL

CLASSIFIC ATION
SYSTEM

CLASSIFI CATION
S!_ = WATER-TABLE
HORIZONTAL SCALE: 1" = 10 0'

FIG URE
------------------------------------------- �
Attachment B
�
I
c,.,
w w
z
w
en
0 z
0 3: 0
w 0
� ERC
-.. � Environmental
and Energy
Services Co.

C
NORTH
D81 0 -
SP
SP
SP/SC
20 SP
SP
SP
·SP
40 ML
SP
SM/ML
GC
GC
60 SW/GW
SW/SP
SP
SP
80 SW/SP
SW/SP
...
10 0
D83 D84
C'
SOUTH
SMW✓ SMW2 \NB 15 D82
I

SP SP SP SP

SP SP SP

SM SP SP/SC SM
... SM SP SM/SC
SW ... SM
SW SP
... SP/SC
ML ML ML SM SM • ML ML Cl
'> CL SM SM CL ML SM CL

SM ML GC SW/SP SP

SW SM SW
SP
z
CH
SP SC GP ·•sp SP
SP
SP GW
GM/GC SW ..

SP
SW
SP ...

Cross-Sectio n C - C'

GROUND SURFACE

TAN TO LIGHT BROWN ,
Sil TY AND CLEAN

FIN E-TO-MEDIUM- GRAI NED SANDS

BROWN TO TAN SILT, CLAYEY SILT,

SILTY CLAY, CLAYEY GRAVEL,
AND SANDY Sil T

WELL-TO POORLY-SORTED

FIN E-TO COARS E-GRAINE D SANDS

WITH MIN OR GRAVEL
Ml =
v=
LEGEND

UN IFIED SOIL

CLASSIF ICATION
SYSTEM

CLASSIF ICATION

WATER-TABLE
HORIZONTAL SCALE: 1" = 10 0'

FI GURE
----------------,-------------------------- �
Attachment B
Attachment B
Analytical
Consulting
group, inc.

DRAWN BY:

DATE: Former SEMCO Twist Drill & Tool Company
2936 Industrial Parkway, Santa Maria, California
Cross Section A-A’
Figure 3
Legend
Michael Tiffany
May 2022
Silty sand (SM)
Silt (ML) includes clayey and sandy silts
Clay (CL) includes silty and sandy clays
and clayey sand (SC)
Estimated extent of TCE Impacts > 1 mg/kg

2.1 0.09
nd
nd
2936
Industrial Parkway
2986
Industrial Parkway
Yard Area DrivewayParking
A A’
50 100 150 200 250 300 350 400 450 5000
0 10
20 30
40 50
60 W E
SM
SM
SM
CL
ML
B221
TCE concentration
mg/kg
Soil type
30 Soil Boring
Distance (in feet)
Vertical Exaggeration 1:3
ML
ML
B221B222B224 B227B228
SM nd
SM nd
SM nd
SM nd
SM 0.056
SM 0.018
SM 0.074
CL-SC 0.10
ML 0.26
ML 0.57
SM nd
SM nd
SM nd
SM nd
SM nd
SM 0.0092
SM 0.02
SM 0.11
16 3.6
SM 10
SM 4.8
SM 75
CL-ML 97
SM 8.5
SM 3.1
SM 15
SM 20
CL-ML 5.1
ML 9.5
SM nd
SM nd
SM nd
SM nd
SM nd
SM 0.0076
SM 0.022
CL 0.043
ML 0.40
ML 0.055
SM nd
SM nd
SM nd
SM nd
SM 0.0033
SM 0.012
SM 0.0031
CL 0.016
ML 0.13
SM 0.096
SC
SC
ML
ML
SM
ML
SM
ML
ML
CL
SM
ML
SM
ML
SC
SC
ML
CL
SM
SC
ML
SM
ML
SC
SM
Attachment B
Attachment B

APPENDIX C

HISTORICAL GROUNDWATER, SOIL, SOIL VAPOR, AND

INDOOR AIR DATA

Attachment B
µ µ µ µ µ µ µ µ µ µ µ µ µ µ µ
Attachment B
µ µ µ µ µ µ µ µ µ µ µ µ µ µ µ
µ
Attachment B
Table C2
Historical Soil Analytical Data
SEMCO, Santa Maria, California
781016901
September 2025
Semi-
Volatile
Organic
Compounds
1,1,1-Trichloroethane
1,1,2-Trichloroethane
1,2-Dichloroethane
Cis-1,2-Dichloroethene
Dibromochloromethane
Tetrachloroethene (PCE)
Toluene
Total 1,2-Dichloroethene
(Cis and Trans)
Trans-1,2-Dichloroethene
Trichloroethene (TCE)
Vinyl Chloride
1,4-Dioxane (P-Dioxane)
Petroleum Hydrocarbons
(C04-C12) GRO
Petroleum Hydrocarbons
(C13-C22) DRO
Petroleum Hydrocarbons
(C23-C40) ORO
Total Petroleum
Hydrocarbons
Arsenic
Barium
Beryllium
Cadmium
Chromium, Total
Cobalt
Copper
Lead
Mercury
Molybdenum
Nickel
Vanadium
Zinc
71-55-6 79-00-5 107-06-2 156-59-2 124-48-1 127-18-4 108-88-3 540-59-0 156-60-5 79-01-6 75-01-4 123-91-1 PHCC4C12 PHCC13C22 PHCC23C40 TPH 7440-38-2 7440-39-3 7440-41-7 7440-43-9 7440-47-3 7440-48-4 7440-50-8 7439-92-1 7439-97-6 7439-98-7 7440-02-0 7440-62-2 7440-66-6 7 0.076 0.007 0.19 0.35 0.08 3.2 NS 0.65 0.085 0.0015 0.00017 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 7,300 5.1 2.1 85 39 2.7 5,300 NS 600 6.1 0.15 22 2,000 1,200 NS NS 0.31 220,000 230 1,100 NS 350 47,000 320 190 5,800 11,000 5,800 350,000 7,200 6.3 45 78 290 33 4,700 NS 570 18 3.4 210 NS NS NS NS 0.98 3,000 27 51 NS 28 14,000 160 44 1,800 86 470 110,000 Sample Name Original
Sample Name
Sample
Date
Sample
Depth mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg B1-1_6.0-6.5_110988 B1-1 11/09/1988 6-6.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U NA NA <0.01 U <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B1-2_11.0-11.5_110988 B1-2 11/09/1988 11-11.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U NA NA <0.01 U 0.23 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B2-1_1.5-2.0_110988 B2-1 11/09/1988 1.5-2 <2 U <2 U <2 U NA <2 U <2 U NA NA <2 U 170 <2 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B2-2_6.0-6.5_110988 B2-2 11/09/1988 6-6.5 <20 U <20 U <20 U NA <20 U <20 U NA NA <20 U 1,800 <20 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B3 B3-3_11.0-11.5_110988 B3-3 11/09/1988 11-11.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U NA NA 0.12 <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B4-2_5.5-6.0_110988 B4-2 11/09/1988 5.5-6 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U NA NA 0.3 0.49 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B4-3_11.0-11.5_110988 B4-3 11/09/1988 11-11.5 <0.04 U <0.04 U <0.04 U NA <0.04 U <0.04 U NA NA <0.04 U 6.3 <0.04 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B5-1_2.0-2.5_110988 B5-1 11/09/1988 2-2.5 <100 U <100 U <100 U NA <100 U <100 U NA NA <100 U 7,400 <100 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B5-2_5.5-6.0_110988 B5-2 11/09/1988 5.5-6 <100 U <100 U <100 U NA <100 U <100 U NA NA <100 U 4,500 <100 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B6-1_2.0-2.5_110988 B6-1 11/09/1988 2-2.5 <0.5 U <0.5 U <0.5 U NA <0.5 U <0.5 U NA NA <0.5 U 38 <0.5 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B6-2_6.0-6.5_110988 B6-2 11/09/1988 6-6.5 <20 U <20 U <20 U NA <20 U <20 U NA NA <20 U 1,300 <20 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B7-1_2.0-2.5_110988 B7-1 11/09/1988 2-2.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U NA NA <0.01 U 0.52 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B7-2_6.0-6.5_110988 B7-2 11/09/1988 6-6.5 <0.1 U <0.1 U <0.1 U NA <0.1 U 0.27 NA NA 0.1 9.9 <0.1 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B8-2_6.0-6.5_110988 B8-2 11/09/1988 6-6.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U NA NA <0.01 U 0.046 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B8-3_11.0-11.5_110988 B8-3 11/09/1988 11-11.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U NA NA <0.01 U 4.4 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B9 B9-2_6.0-6.5_110988 B9-2 11/09/1988 6-6.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U NA NA <0.01 U 0.033 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B10-2_6.0-6.5_110988 B10-2 11/10/1988 6-6.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U NA NA <0.01 U 0.046 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA B10-3_11.0-11.5_110988 B10-3 11/10/1988 11-11.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U NA NA <0.01 U 0.018 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB3-1_40.0-45.5_013190 DB3-1 01/31/1990 40-45.5 <0.05 U <0.05 U <0.05 U NA <0.05 U <0.05 U <0.12 U 66 NA 430 <0.05 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB3-2_50.0-50.5_013190 DB3-2 01/31/1990 50-50.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U 0.015 NA 0.066 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB3-3_55.5-56.0_013190 DB3-3 01/31/1990 55.5-56 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U <0.01 U NA <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB3-4_60.5-61.0_013190 DB3-4 01/31/1990 60.5-61 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U <0.01 U NA <0.01 U <0.01 U NA NA NA NA <1 U NA NA NA NA NA NA NA NA NA NA NA NA NA DB3-5_65.5-66.0_013190 DB3-5 01/31/1990 65.5-66 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U <0.01 U NA 0.017 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB3-6_70.0-70.5_013190 DB3-6 01/31/1990 70-70.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U <0.01 U NA <0.01 U <0.01 U NA NA NA NA <1 U NA NA NA NA NA NA NA NA NA NA NA NA NA DB3-7_75.5-76.0_013190 DB3-7 01/31/1990 75.5-76 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U <0.01 U NA <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB3-8_82.5-83.0_013190 DB3-8 01/31/1990 82.5-83 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U 0.019 NA 0.03 <0.01 U NA NA NA NA 3 NA NA NA NA NA NA NA NA NA NA NA NA NA DB3-9_87.5-88.0_013190 DB3-9 01/31/1990 87.5-88 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U <0.01 U NA 0.014 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB4-1_40.0-40.5_020290 DB4-1 02/02/1990 40-40.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U 0.017 NA 0.026 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB4-2_45.5-46.0_020290 DB4-2 02/02/1990 45.5-46 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U 0.081 NA 0.2 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB4-3_50.0-55.5_020290 DB4-3 02/02/1990 50-55.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U <0.01 U NA 0.019 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB4-4_60.0-60.5_020290 DB4-4 02/02/1990 60-60.5 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U <0.01 U NA <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB4-5_65.5-66.0_020290 DB4-5 02/02/1990 65.5-66 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U <0.01 U NA 0.016 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DB4-6_70.5-71.0_020290 DB4-6 02/02/1990 70.5-71 <0.01 U <0.01 U <0.01 U NA <0.01 U <0.01 U <0.025 U <0.01 U NA <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DMW--1-1_56.5_112890 DMW1-1 11/28/1990 56.5-56.5 <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U 0.04 NA <0.01 U <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DMW--1-2_64.5_112890 DMW1-2 11/28/1990 64.5-64.5 <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U 0.05 NA <0.01 U <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DMW--1-3_110.5_112890 DMW1-3 11/28/1990 110.5-110.5 <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.025 U NA <0.01 U <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DMW--1-4_148.5_112990 DMW1-4 11/29/1990 148.5-148.5 <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U 0.03 NA <0.01 U <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DMW-3-1_39.0_030791 DMW3-1 03/07/1991 39-39 <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.025 U NA <0.01 U <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DMW-3-2_49.0_030791 DMW3-2 03/07/1991 49-49 <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U 0.078 NA <0.01 U <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DMW-3-3_60.5_030791 DMW3-3 03/07/1991 60.5-60.5 <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.025 U NA <0.01 U <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DMW-3-4_90.0_030791 DMW3-4 03/07/1991 90-90 <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.025 U NA <0.01 U <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DMW-4-1_39.0_030891 DMW4-1 03/08/1991 39-39 <0.01 U <0.01 U <0.01 U 0.02 <0.01 U <0.01 U <0.025 U NA <0.01 U 0.25 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DMW-4-2_49.0_030891 DMW4-2 03/08/1991 49-49 <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.025 U NA <0.01 U 0.05 <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA DMW-4-3_68.5_030891 DMW4-3 03/08/1991 68.5-68.5 <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.01 U <0.025 U NA <0.01 U <0.01 U <0.01 U NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Petroleum Hydrocarbons
DMW-4
DB3
DB4
DMW-1
Location
B8
B10
B6
B7
Historic Soil Investigations (1986-1991)
Metals
Analyte
CAS Number
Leaching to Groundwater ESL
DMW-3
Soil Direct Exposure Construction Worker: Any Land Use ESL Volatile Organic Compounds
Soil Direct Exposure Commercial/Industrial ESL
B1
B2
B4
B5