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,RpN MEQ T` 9 P�1R�KER SER V1C�5 Project 225-01-01 January 17, 2002 Ms. Michelle Sterni-Le Environmental Health Specialist San Joaquin County Environmental Health Division 304 East Weber Ave. Stockton, CA 95202 Subject: Soil Sampling under Pumps and Piping at California Stop, 2224 Manthy Road, Stockton, California Dear Ms. Sterni-Li: This letter documents the soil sampling and sample analysis associated with the removal of gasoline pumps and lines at the subject site. Sample Collection Soil sampling was done on January 10, 2001 under the observation of Ms. Michelle Sterni -Le from the San Joaquin County Environmental Health Division. The soil samples were obtained from underneath each of the four former pump locations (see the attached figure). Pea gravel was removed from under the concrete island to about 2 feet below grade surface (BGS) where native soil began. A 4-inch diameter hand auger was used to drill to approximately two feet into the native soil. Once that depth was reached, a sampling shoe with a clean brass tube insert was hammered into the native soil to obtain the samples. Total sampling depth was about four feet BGS. Aluminum foil and plastic caps were placed over the tube ends. The tubes were then labeled and placed on ice for transport to the testing laboratory for certified chemical analysis. Mild to slight petroleum hydrocarbon odors were noted during sampling. Additional soil was removed to an approximate depth of 13 feet BGS to remove all petroleum containing soil. No composite sample was taken of the soil because all removed materials were pea gravel. A chain of custody form accompanied the samples to the lab. No groundwater was encountered to a depth of 4 feet BGS during sampling. The sampled soils were highly plastic clays and sandy clays. 190 East 7th Street • Pittsburg, CA 94565-2317 •FAX(925) 439-2566 • Phone (925)439-1024 0