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Lb <br /> Wright <br /> ` Environmental <br /> Services, Inc. <br /> May 10,2000 Construction ♦ Engineering • Remediation <br /> Project No.4669 <br /> I; <br /> M&M Builders Supply <br /> t P. O. Box 1107 <br /> Tracy, CA 95378-1107 <br /> Attn.: Mr. Shawn Kelly <br /> Re: Preliminary Site Assessment Investigation, `= <br /> M&M Builders,8111 West 11th Street,Tracy,CA; <br /> PHS EHD Site Code 1530;Wright Project No.4184.1 <br /> Dear Mr.Kelly, <br /> Wright Environmental Services, Inc. (Wright) performed the Preliminary Site Assessment investigation r <br /> at the above referenced site located at 8111 West Eleventh Street. Tracy, CA(see Figure 1). The purpose <br /> of this work is to ascertain the depth to,-gw er, and identify suspected petroleum contaminants in <br /> soil and groundwater near and around the former tank pit areas as required by the San Joaquin County <br /> Public Health Services Environmental Health Division (PHS EHD) in their letters dated August 16, 1999 <br /> and December 29. 1999. <br /> r4' <br /> Background <br /> Two underground storage tanks have been removed from the site;one 1,000-gallon diesel tank on August <br /> 8, 1988 and one 1,000-gallon gasoline tank on June 23, 1994. Soil samples and groundwater samples <br /> showed the presence of Total Petroleum Hydrocarbons(TPH)as Gasoline(TPHG), and Benzene,Toluene, <br /> Ethylbenzene and Xylenes (BTEX). A water sample from the former gasoline tank location appeared <br /> anomalous and a re-test or explanation of sampling protocol for that sample (sampled on July 28, 1994) <br /> was requested by PHS EHD. Apparently this sampling/protocol issue was never resolved to satisfaction <br /> and the PHS-EHD, who then requested a vertical and horizontal site assessment investigation to be <br /> performed on the site. A 2000-foot radius water well survey was performed prior to the site investigation <br /> to locate wells registered with the State of CA and the City of Tracy. This information was sent to PHS <br /> EHD in Wright's letter dated February 24, 2000. <br /> Field Methods <br /> Exploratory Borings <br /> Five exploratory borings were drilled at the site (Figure 1) on March 17, 2000. The borings were <br /> positioned to ascertain distribution of the contaminants in site soil and groundwater. Drilling permits <br /> were secured from the PHS EHD, and all utilities were cleared prior to doing the field work. The borings <br /> were used to define the uppermost aquifer strata, and two selected borings advanced through the former <br /> tank pits were advanced through the uppermost aquifer to the contact of. and into the underlying <br /> confining strata of the uppermost aquifer. <br /> 67 E. 10th Street • Tracy,CA 95376 <br /> 209.833.0758 . Fax 209.832.5152 <br /> wright@inreach.com Lic. #651501 A-B Ha--Mat <br /> websit http://home.inreach.com/wright <br />