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x tIN <br /> � <br /> LN <br /> Wright <br /> z; Environmental s <br /> Services, Inc. <br /> Constmetion e Engineering • Remediation <br /> �lZlc.if�— / <br /> �G f•7r✓G rre e i5v At,,/ <br /> Y�Pvz�o1�� J`eu/.h <br /> June 4, 2007 <br /> Projedt No, 4090 <br /> Michael Infurna Jr,,-Senior RE,.HS <br /> SAN JOAQUIN COUN'ry lair VARONMENTAL HEAL-ni D Et'AEZT14!It;t+T + <br /> 304 East Weber Avenue, `l'hi:rd'Floor <br /> Stockton, California 95202-2708 <br /> SUBJECT: Resu% of Son VapcIr Sampling <br /> Cox & Cox,ff oemer lir.Eel's Muffler,Site Cgdf- I933 <br /> Z .East I P" Street,Tracy,CA 95736 <br /> Dear Mr_ In <br /> fiarna: <br /> 5 <br /> Wright Envii7onnlentad Services <br /> Inc. (Wright) has prepared flus letter report to document the <br /> 01-Itcome of the required soil vapor sampling activities that were recently conducted at the subject <br /> fuel leak site in I',-acy. Wright's Work Plan describing the proposed soil vapor assessment <br /> {Wright, 2006) was approved by the EHDuia Satz Joa <br /> { 9 a Cowity Environmental Health <br /> Deparftnent) on February 28, 2007. An. EHD Well Permit was also obtained for the work. <br /> Copies of both of these documents are provided in Appendix A. <br /> BACKGROUND AND <br /> IlN7l'l;_l;ODl{TCT'IIOIN <br /> ( <br /> The underground fuel tanks and associated fueling facilities for this 'Tracy site were removed in <br /> early 1990 along:with the soil From the tank,pit. Multiple investigative events were subsequently <br /> performed as it was clear a fuel release had occurred. 'I'hese investigations covered both parts of <br /> the subject site (i.e., the front/south commercial part and the back/north mobile home park part) <br /> as well as the adjoining portions of the school property to the north(downgradierit)and the Heinz <br /> property to the east. A northward trending area of soil and groundwater impact was defined, <br /> Primarily lying between two large, N-S oriented buried pipelines, a 48-inch diameter irrigation <br /> water pipe and a 36-inch diameter sanitary sewer pipe. A network of nine groundwater <br /> monitoring wells was installed over time with regular testing events that continue today. <br /> In 2004 an extensive remediation program was undertaken involving the removal of <br /> approximately 900 cubic yards of the most heavily impacted accessible soil, plus nearly 240,000 <br /> gallons -of contaminated groundwater. Numerous physical constraints made additional <br /> excavating not feasible. <br /> 767 East 11 Street Pg&J�264+ Tracy,CA 95376 <br /> 269.833.0758 a Fax 209.832.5M <br /> wright rt inreach,com I it #631591 d-B HazMar, C21 <br /> websit hUp://ws•iglztenvironmentalse"iees.com <br /> F <br />