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WATERWORK CORP. <br /> A RESN l Company <br /> Environmental Solutions <br /> Through Applied Science, <br /> t Engineering&Construction <br /> 1710 Main Street <br /> Esralon, CA 95320 <br /> Phone: (209)838-3507 <br /> Fax: (209)838-3509 <br /> December 6, 199I <br /> I Mr. Michael Infurna <br /> San Joaquin County Public Health Services ` <br /> Environmental Health Division DEC <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> HE: King Island Resort <br /> 11530 W. Eight Mile Road, Stockton, California. <br /> Site Code: 1557 <br /> x <br /> Dear Mr. Infurna: <br /> Enclosed are the Iatest analytical results and chain-of-custody documents for groundwater <br /> samples collected from the above referenced site. Groundwater monitoring and sampling was <br /> conducted by RESNA Industries personnel on October 18, 1991. Water level measurements <br /> were collected from each monitoring well prior to purging and sampling (Attachment 1). Water <br /> levels have dropped from 0.80 to 2.56 feet since Iast monitoring in April 1991. A groundwater <br /> gradient map was created using the data collected on October 18, 1991 (Figure 1). The gradient <br /> is approximately 0.05 feet/feet or 264 feettmile in a northeast direction. <br /> Subsequent to monitoring, each well was purged by extract Ig approximately 4 well volumes. <br /> While purging,the groundwa er parameters(temperature, conductivity,and pH)were monitored <br /> and allowed to stabilize before water samples were collected. The samples were transported to <br /> and analyzed by state-certified Sequoia Analytical in Concord, California. <br /> Samples were analyzed for BTEX using EPA method 802015(12 arid, TPHG and TPHD using <br /> modified EPA Method 8015, Monitoring Weil MW4 did not contain enough water to analyze <br /> s for TPHD. Monitoring Wells MW 1, MW2, and MW3 did not coritaiu.datectable concentrations <br /> of any petroleum hydrocarbon analyte. Monitoring wells MW4 and MWS contained benzene <br /> concentrations of 690 and I,300,ug/l,respectively and TPHG concentrations of 3,400 ane:4,403 <br /> pg/l, respectively along with detectable:T, E, X, and TPHD (MW5). Laboratory reports with <br /> --— - <br /> ---- ----- -chain=of-custody-documents-are-included-in AttachrrienE 2.--Table 2--summarizes laboratory <br /> I <br /> U analyses. <br /> KIRL1209.7'LP <br /> ,y J <br /> A: <br /> - _ _ <br />