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� rNe Vv' 1OV Jv <br /> f `Vv <br /> TWINING <br /> LABORATORIES , INC . <br /> ANALYTICAL CHEMISTRY •ENVIRONMENTAL SERVICES <br /> GEOTECHNICAL ENGINEERING •SAMPLING SERVICES <br /> CONSTRUCTION INSPECTION & MATERIALS TESTING <br /> October 18, 1999 E29001,0113 <br /> Crossroads R/W and Suzanne Sullivan Real Property Services <br /> 6680 Alhambra Avenue,No. 506 <br /> Martinez, California 94553 <br /> Attn: Ms. Suzanne Sullivan <br /> Subject: Soil Sample Analyses for Underground Storage Tank Removal <br /> Project: Gateway Block <br /> Southwest Corner of Lafayette and El Dorado Avenues <br /> Stockton, California <br /> Dear Ms. Sullivan <br /> This report summarizes the field observations and analytical results of soil samples collected <br /> during the removal of underground storage tanks (USTs) at the above-referenced project site on <br /> September 20, and October 8, 1999. <br /> AUTHORIZATION <br /> Services provided by The Twining Laboratories, Inc. (Twining) were authorized by Ms. Suzanne <br /> Sullivan in an"Authorization to Proceed", TLP 3799-0484B dated August 3, 1999 and TLP <br /> 3799-0484C dated September 24, 1999. <br /> OBSERVATION AND SAMPLING PROCEDURES <br /> Upon removal of the USTs, the depth to the base below site grade was measured and recorded. <br /> The physical dimensions of the USTs were measured and are summarized in Table 1. The USTs <br /> were observed for oxidation, discoloration, holes, and other distinguishing physical <br /> characteristics. Soils within the UST excavation were observed for discoloration and the <br /> presence of petroleum product odors. <br /> The soil samples recovered from beneath the former UST locations were collected by driving a <br /> precleaned stainless steel sleeve into soil retrieved by a backhoe. Soil samples from beneath the <br /> former dispenser locations were collected from the bottom of a soil borehole drilled with a hand <br /> auger. The samples were collected by driving a soil sampler equipped with a stainless-steel <br /> retention sleeve into the undisturbed soil at the bottom of the borehole. Soil cuttings generated <br /> during hand augering were replaced in the borehole after sampling. Soil sample locations and <br /> depths were specified by the San Joaquin County Public Health Services' (SJCPHS) on-site <br /> representative. Two soil samples were also collected from the soil stockpiles at the project site <br /> CORPORATE OFFICE MODESTO VISALIA BAKERSFIELD SALINAS <br /> 2527 Fresno Streel 4230 Kiernan Ave.,N105 130 North Kelsey St #H6 3701 Pegasus Drive,#124 520##A Crazy Horse Canyon Rd. <br /> Fresno,CA 93721.1804 Modesto,CA 95256-9322 Visalia,CA 93291.9000 Bakersfield,CA 93308.6843 Salinas,CA 93907.8434 <br /> (559)268.7021 •Fax 268-7126 (209)545-1050•Fax 545-1147 (559)651-8280•Fax 651.6288 (661)3935088•Fax 393.4643 (831)449-5284•Fax 449-5092 <br />