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W <JE- 1386 E BEAMER STREET <br /> WOODLAND CA 95695 9603 <br /> WESTERN GEO-ENGINEERS FAX(916)6620273 <br /> CALIF CONTRACTOR It 513857 A CORPORATION (91 6) 662-451 <br /> REGISTERED GEOLOGISTS <br /> MAY 31, 1990 RECEIVED <br /> JUN 81940 <br /> Mr. John Margowski ENVIRONMENTAL HEALTH <br /> Wickland Properties PERMIT/SERVICES <br /> 1765 Challenge Way <br /> Sacramento, Ca. 95814 <br /> (915) 921-1100 <br /> RE: Update status report and work plan to clean ouf excavation <br /> and install a 4" slotted PVC pipe within excavwiion for later <br /> vapor recovery at former Regal Station 604, lorat ed a 1448 N. El <br /> Dorado Street., Stockton, California. <br /> Dear Mr. Margowski: <br /> As von: requested Western Geo-Engineers (WEGE) sampled the aerated <br /> .oil piles on May 25, 1990. During this site visit depth to <br /> ground water was also measured in the four existing monitor wells. <br /> A ground water gradient map developed from these readings shows a <br /> similar gradient as defined in our Status Report #2, dated <br /> February 26, 1990, see Figure 4C. All eight soil samples of the <br /> aerated soil are below detection limits, see Figure 3 and Table 2. <br /> Soil contamination, gasoline range hydrocarbonse exists to 15 feet <br /> below the surface beneath the aastern and center pump dispersing <br /> islands. Soil contaminatior associated with the tank excavation <br /> is gasoline range hyt'rocarbcâ–ş'iis to the :;0 foot depth; ground water <br /> is encountered at approximately 47 feet below the surface. <br /> SOIL AND GROUND WATER SAMPLING PROCEDURES <br /> All samples were obtained by a qualified geologist working <br /> directly under the supervision of California Registered Geologist <br /> #3037. 11he samples were collected, preserved, labeled and chain <br /> of Custody hard delivered to ChemTech Analytical Laboratories, <br /> 3017 Kilgore Road #110, Rancho Cordova, CA 95742 (916-635-3962) . <br /> ChemTech is a State of California certified lab (#359) . All <br /> samples obtained from the borings and monitor wells were analyzed <br /> using the following EPA and DOHS methods: 5030 for extraction, <br /> 8015-TPN, and 8020/602-BTEX. Since initial sampling showed that <br /> TEL and EDB did not exist at this site these analyses were not <br /> carried on for thio sampling. <br /> Soil samples were obtained from the aerated soil piles by hand <br /> augeri.ng a 4" diameter hole then obtaining the sample by hand <br /> driving a 2"x6" sterile brass sleeve that has been inserted into a <br /> barrel sampler attached to rod extensions and a slam hammer, all <br /> samples came from the 2 foot level of the piles, see Figure 3. <br /> ti <br /> 1 <br />