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San Joaquin County <br /> .� Environmental Health Department DIRECTOR <br /> F� 9 Linda Turkatte, REHS <br /> z i 1868 East Hazelton Avenue <br /> OGRAM Q: <br /> Stockton, California 95205-6232 PRRobert McCllllon,REHSORS <br /> l <br /> Jeff Carruesco, REHS,RDI <br /> 0.- p Kasey Foley, REHS <br /> F6' `', Website: wwwsjgov.org/ehd Rodney Estrada, REHS <br /> Phone: (209) 468-3420 Adrienne Ellsaesser, REHS <br /> Fax: (209) 464-0138 <br /> December 16, 2014 <br /> Paul Canepa <br /> Canepa's Car Wash Downtown <br /> 642 N. Hunter St. <br /> Stockton, CA 95202 <br /> Subject: Groundwater Monitoring and Remediation Site Code: 1148 <br /> Canepa's Car Wash <br /> 248 E. Park St. <br /> Stockton, CA <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Groundwater <br /> Monitoring Report- First Quarter 2014 (GWM Report 1 st Q 2014), dated 07 May 2014, and three <br /> dual phase extraction reports for the fourth quarter 2013 and the first and second quarters of <br /> 2014, all prepared by your consulting firm Advanced GeoEnvironmental, Inc. (AGE). <br /> Monitoring wells (MW) and dual phase extraction (DPE) wells on the site are divided into four <br /> depth categories, with well screen intervals roughly corresponding to potential contaminant <br /> migration pathways in sand units: <br /> • Shallow Zone, screened approximately 15-45 feet below surface grade (bsg), monitored <br /> by MW-8, MW-13, MW-15, MW-18, MW-19, and DPE-1 through DPE-4; <br /> • First Intermediate Zone, screened approximately 40-65 feet bsg, monitored by MW-1 <br /> through MW-7; <br /> • Second Intermediate Zone, screened approximately 75-88 feet bsg, monitored by MW-9, <br /> MW-11, MW-14, and MW-16; <br /> • Deep Zone, screened approximately 100-110 feet bsg, monitored by MW-10, MW-'12, <br /> and MW-17. <br /> The EHD is of the opinion that the sand unit at the base of a number of Shallow Zone well <br /> screen intervals is the same sand unit at the top of the First Intermediate Zone well screen <br /> intervals, so many of these wells monitor the same potential contaminant migration pathway. <br /> GWM Report 1st Q 2014 discusses the findings of a groundwater sampling event that occurred <br /> on February 6 and 7, 2014. In this paragraph, concentrations in micrograms per liter (Ng/L) of <br /> petroleum hydrocarbons as gasoline (TPH-g) are given in parentheses following the designated <br /> MW sampled on the aforementioned dates. Wells near the former underground storage tanks' <br /> (UST) area are MW-9 (50,000 pg/L) and MW-10 (1,600 pg/L). Wells inferred to be <br /> downgradient (and approximately 160 feet) east-northeast of the former UST area are MW-5 <br />