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Kn ICLEINFELDER March 5, 1993 KnotIVE File 24-220152-D00 MAR 8 1993 ENVIRONMENTAL HEALTH PERMIT/SERVICES Ms Linda Turkette San Joaquin County Public Health Department Environmental Health Division P.O Box 2009 Stockton, CA 95201 Subject: Proposed Remediation Update San Joaquin County General Hospital 150 Hospital Road French Camp, California Dear Ms Turkette- • Enclosed is the work plan amendment we discussed This amendment explains more fully the hydrocarbon remediation by excavation proposed for the T2/T3 UST site at the San Joaquin County General Hospital in French Camp, California As you witnessed, Kleinfelder installed three groundwater monitoring wells in three of four borings in January 1993, and drilled four additional soil borings in February 1993 The wells were triangulated around the location of the USTs to evaluate the groundwater gradient Each of the wells was completed within approximately 10 feet of the USTs to assess the potential that groundwater had been impacted by hydrocarbons released from the USTs Two sets of depth to groundwater measurements indicate that the gradient is essentially flat As is expected with flat gradients, the direction shifted between the two measurement dates (south to west) The first set of water sample results indicates that groundwater has not been impacted The second sampling round is scheduled for March 26, 1993 The destruction of the three monitoring wells is discussed in this amendment. If the water samples collected on March 26, 1993 contain constituents of concern, the well destruction schedule will be reassessed The analytical and field screening results indicate that petroleum hydrocarbons have impacted approximately 1,000 cubic yards of soil near the UST location An additional 1,000 cubic yards of non-impacted soil will need to be removed to access impacted soil Soil appears to be impacted to a depth of nearly 30 feet below the west end of the tanks Impacted soil appears to be present between the depths of approximately 15 to 23 feet outside a radius of approximately 10 feet from the tanks This work plan amendment summarizes the analytical results on which the remedial recommendation is based, and presents Kleinfelder's verification sampling and excavated soil disposition plan Based on our discussion, Klemfelder is currently planning to provide the FWP3-2(1993) Page 1 of 2 24-220152-D00 Copy ri ht 1993 Kleinfelier Inc ( KLEINWrDl K 3077 Fite Circ e, Sacramento, CA 95827 (916) 366-1701