Laserfiche WebLink
DEC 02 198 10:54AM SMITH/ATC ASSOCIATES F. 1 <br /> ATC ASSOCIATES INC. 1117 Lone Palm Ave, Suite s <br /> Modesto, CA 95351 <br /> Tel. 209/579.2221 <br /> 7ELECOPY MESSAGE Fax aoe�s7e 2225 <br /> To: Harlin Knoll Date: December 2, 1998 <br /> Of: PHSIEHD Job/Proposal No.: 16962.0001 <br /> Fax No.: 468-3433 No. of Pages: 8 (incl, this page) <br /> From: Tom Lutterman ' Hard copy to follow: No <br /> Project/Subject: 400, 544, and 560 Industrial Park Drive, Manteca, CA <br /> If you have trouble receiving this information, or you did not receive <br /> the specified number of pages shown above, please 0311 (2091579-2221. DEC (l 2 1998 <br /> Comments: <br /> LNVIRONMEi'NTAL HEALTH <br /> Laboratory results and sample locations are attached for the work pdfftrth0R[,,r*CES <br /> November 1998. Depth to water was measured at approximately 13 feet bgs. <br /> The groundwater flow direction on November 18, 1998 was northwest. <br /> Fourteen soil gas samples were collected at 10 feet bgs. Analytical results are <br /> summarized in table 1. Low concentrations of 1,1,1-TCA (0.34-5.5 ppb) were <br /> detected in the vicinity of the site's water treatment system. <br /> Three wells (MW1, MW4 and MW6) were sampled. All samples were analyzed for <br /> VOCs (8010/8020) and a sample from MW4 (located nearest the treatment <br /> system) was analyzed for priority pollutant metals and SVOCs. Analytical results <br /> are included in Tables 2 and 3. <br /> A total of five soil borings were advanced at the site using direct push. Two of <br /> these borings were angled 10 to 14 feet bgs under the closed diesel UST that had <br /> never been used and filled in place with pea-gravel No field observations <br /> indicated TPHd was present. Soil and one water grab sample detected TPHd at <br /> relatively low concentrations. No TPHg/BTEX was detected (Table 4). <br /> The remaining three soil borings were advanced to 4 feet bgs in the area of an old <br /> oil surface spill (5-10 gallons) which occurred on an asphalt covered lot. The spill <br /> was cleaned-up with absorbent. One soil sample from each boring was collected <br /> from 3.5 feet bgs and analyzed for TOG and PCBs. No PCBs were detected <br /> although oil and grease was. These results are summarized in Table 4. <br /> It is ATC's opinion that the only area which may require additional work at this <br /> time is the area of the diesel tank. The RP is concerned whether PHS/EHD will <br /> require additional work, such as a monitoring well, with respects to the closed <br /> diesel tank. A bank loan is currently pending regarding this issue. <br /> Your assistance in this matter is most appreciated. <br />