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PUBLIC HEALTH SERTICES,. <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. <br /> Heakh Officer • c .. �p <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 °��x j5* <br /> (209) 468-3400 <br /> KURT MILLER <br /> SHELL OIL COMPANY APR 1 7 1992 <br /> P 0 BOX 40023 <br /> CONCORD CA 94524 <br /> Re: Hammer Lane Shell SITE CODE: 1660 <br /> 7910 Lower Sacramento Road <br /> Stockton, CA 952 .0 <br /> San Joaquin County Public Health Services, EnvironmentaliHealth <br /> Division (PHS/EHD) has completed review of the Aegis <br /> Environmental correspondence dated March 18, 1992 . .! PHS/EHD has <br /> the following comments for your consideration. <br /> PHS/EHD requested by letter dated January 29 , 1992 that a .,work . <br /> plan for additional groundwater investigation be submitted by <br /> April- 15, 1992 . Aegis responded to PHS/EHD by stating that iti. <br /> was their opinion that the installation of an additi.onal0 <br /> monitoring well was not warranted at this time. Additionally <br /> Aegis stated that an additional groundwater investigation was not <br /> agreed to by Shell during the November 22 , 1991 meeting. - <br /> While an additional monitoring well was not discussed during the <br /> November 22, 1991 meeting, it was agreed that at this time <br /> groundwater monitoring would continue in lieu of soll <br /> remediation. Monitoring of the soil contamination associated <br /> with the northern-most dispenser cannot be accomplished using <br /> existing monitoring wells, MW-1, MW-2, and MW-3 . Tri-Regional <br /> guidelines recommend that a monitoring well be placed within 10 <br /> feet of documented contamination. Monitoring well MW-3 , ' the <br /> nearest, is approximately 100 feet from the northern dispenser; <br /> thereby, not qualifying as a monitoring well capable of <br /> monitoring the contamination. <br /> An additional monitoring well is requested primarily because the <br /> boundaries of contamination, associated with the northern <br /> dispenser, have not been established. The sample of thenorthern <br /> dispenser detected 1, 510 ppm TPH-gasoline and was tAken ' at three <br /> feet which was approximately 42 feet from seasonal !high . <br /> groundwater (San Joaquin County Flood Control Map Spring of <br /> 1986) . However, there is no evidence to suggest the vertical or <br /> horizontal extent of this contamination. Please submit a work <br /> plan which will document the boundaries of contamination, <br /> associated with the northern dispenser, by June 15, 1992 . <br /> A Division of San Joaquin County Hc2dh Care Services <br />