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CONSTRUCTION TE TING &`"ENGINEERING, INC. <br /> sA1v DIEGO,CA RIVFRSIDB,CARA,,1CA7 -' r ► j� 7 fi. LANCASTER,cn <br /> 2414 Vineyard Ave. 490 E Princeland Ct. 1645 1,adfic Ave '30'w.'Lairhh Rd. 42156 10th Si.W. <br /> shite G Suite 7 Suitej(1�r7r, ire 19 Unit K <br /> GO$ Escondido, CA 92029 Corona,CA 91719 Oxnar , 95033, , 95 Lancaster,CA 93534 <br /> (760) 746-4955 (909) 3711890 (805) 486-6475 (209) 839-2 (805)726-9676 <br /> ENGINEERING, INC. (760) 746-9806 FAR (909) 371-2168 FAx (805) 486-9016 FAX (209) 839-2895 FAX (805) 726-9676 FAX <br /> December 8, 1997 CTE Job Number: 20-0445B <br /> Mr. Michael J. InfuiTla, Jr., R.E.H.S. <br /> San Joaquin County <br /> Public Health Services, Environmental Health Division <br /> 304 E. Weber Avenue, Third Floor <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> Subject: Workplan: Groundwater Investigation <br /> Proposed Cintra Park Phase II Development, Tract 2705 <br /> Tracy, California <br /> Dear Mr. Infurna: <br /> This workplan includes procedures for the proposed assessment of groundwater encountered <br /> during remedial excavations at the referenced site. Figures 1 and 2 are maps showing the location <br /> of the site. This work plan was prepared based on rete latory agency requirements and anticipated <br /> site subsurface conditions. As our client is inti t:s± _' in beginning this work soon we would <br /> appreciate your prompt review. <br /> SITE BACKGROUND <br /> Two underground storage tanks (USTs),reportedly containing leaded and unleaded gasoline, were <br /> excavated and removed at the site in June 1997. At that time it was determined that an unauthorized <br /> release had occurred. <br /> In July 1997 approximately 800 cubic yards of hydroca bon- and non-hydrocarbon-affected soil was <br /> excavated from the site. These excavations, to a maximum depth of approximately 11 feet below <br /> grade (fbg), occurred during site assessment and remedial excavation activities. Based on the <br /> findings of these activities we reached the following c Dnelusions. <br /> • A release of fuel hydrocarbons (gasoline) oc urred from the former USTs onsite. This <br /> release apparently penetrated the soil column 17o a depth of approximately eight to 10 fbg. <br /> 11W0RD1CTR0JECTS1200445\Workp1an-CW we]Ldoc <br /> GEOTECHNICAL AND CONSTRUCTION ENGI EERING TESTING AND INSPECTION <br />