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Advanced , ,,.0"".-, 1�•i4'1 r GeoEnv *l' Pefatal, Inc . =o= of No Aer ' a i furrrrc� 30 September 1996 AGE-NC Project No 95-0141 Mr Greg Gaut Comfort Air, Inc 1601 Turnpike Road Stockton, CA 95201 Subject. Quarterly Monitoting Update - Febivary and September 1996 COMFORT AM, INC , 1601 Tut npike Road, Stockton, Califot ttia Dear Mr Gaut In accordance with your request, Adianced GeoEnvironniental, Inc (AGE) has performed ground water monitoring and sampling at the above referenced site The monitoring and sampling was performed in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Regional Water Quality Control Board (RWQCB) guidelines for the . investigation of underground storage tank (UST) sites PROCEDURES Ground water samples v,ere collected from MNN7-4 on 29 February 1996 and frown MW-5 on 04 September 1996 Ground water samples were transported to Castle Analytical Laboratories (CAL) and analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), -volatile aromatics (benzene, toluene, ethylbenzene and \ylenes BTE&X) and methyl-tertiary butyl ether (MTBE) in accordance ,kith EPA methods 5030 and 602 Analytical results of ground water samples are summarized in Table 1 The laboratory report (CAL Laboratory No 686 and 866) and chain-of- custody forms are included with this report FINTI)INGS Ground eater flow direction was generally toward the southeast at an approximate gradient of 0 01 ft/ft, or 53 feet per stile (Figure 1 -Relative Ground Water Eleti ations Map) Ground 1k ater depths and elevations are summarized in Table 2 TPH_g, benzene and ethylbenzene were detected in ground water samples from well MW-4 in . February at concentrations of 330, 69, and 1 4 yg/1 (microgram per liter or parts per billion ppb), t 1803 West March Lane,Suite A,Stockton,California 95207 Telephone(209)956-0264 FAX(209)956-0700