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MORRIS <br />SHAFFER <br />E N G I N E E R I N G <br />August 10, 2n2, Rev August 31, 2021 <br />Tony Grizelj <br />Metal Finishing Solutions, Inc. <br />1325 El Pinal Drive <br />Stockton, CA 95205 <br />Tank System Integrity Report <br />Morris Shaffer Engineering Project # 20238 [Previous 18211] <br />On October 14, 2020 and January 4, 2021 an engineer from our office visited Metal Finishing Solutions in <br />Stockton to conduct a system integrity assessment of the following tanks, associated piping, and secondary <br />containment of the Waste Treating Area containing hazardous waste: <br />Tank # I Description <br />WT -T1 <br />Acid Waste <br />Cylindrical <br />CAR 000285262 <br />WT -T2 <br />Alkaline Waste <br />Cylindrical <br />CAR 000285262 <br />C1X-T1 <br />System Feed Tank <br />Cylindrical <br />CAR 000285262 <br />C1X-T2 <br />DI Holding Tank <br />Cylindrical <br />CAR 000285262 <br />FN -T1 <br />Neutralization Stage 1 <br />Cylindrical <br />CAR 000285262 <br />FN -T2 <br />Neutralization Stage 2 <br />Cylindrical <br />CAR 000285262 <br />Based on these inspections and our evaluation, we are providing this written certification for the above <br />mentioned tanks following the guidelines of Title 22 California Code of Regulations, Chapter 15, Article 10, <br />Section 66265.192. <br />Seismic Anchorage: The firm that installed the original seismic anchorage components at the time of tank <br />installation has provided seismic anchorage calculations to justify the original anchorage components. Please <br />see Appendix A for seismic anchorage calculations by P.E.S. Engineering Consultants, dated March 25, 2021. No <br />changes to the original anchorage is required. <br />Secondary Containment: For the curb and tanks shown on the attached partial site plan, an 18" tall curb is <br />adequate secondary containment. Please see Appendix B for secondary containment calculations. <br />Corrosion Protection: All (6) tanks included herein are fabricated from polyethylene, the system's piping <br />appears to be PVC, and the secondary containment for all tanks is a concrete slab on grade and concrete berm <br />with a suitable waterproofing material. All of these are corrosion resistant. The pumps do not appear to be <br />leaking at this time and should be monitored. Although it is helpful to visually inspect the interior of the tanks, <br />in this case we have observed these tanks in 2018 and again in 2020 & 2021. Please note all (6) tanks were <br />installed as new in 2018. Given these new tanks have been in service for three years now and we have observed <br />them on three separate occasions, we certify these tanks to be of adequate condition after only 10% of their 30+ <br />year serviceable life. <br />1300 INDUSTRIAL ROAD, SUITE 14, SAN CARLOS, CA 94070, (650) 595-2973 FAX (650) 595-2980 <br />