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WATERWORK CORP. <br /> A RESNA Company <br /> Environmental Solutions <br /> SEP 1 2 1591 Through Applied Science, <br /> �w A� H F AI TH Engineering&Construction <br /> 1710 Main Street E���4 �°VT%�� `�`� <br /> Escalon, CA 95320 <br /> Phone: (209) 838-3507 <br /> Fax: (209) 838-3509 <br /> 0 PCD C\" <br /> August 10 1991 <br /> Ms. Antonia Vorster <br /> California Regional Water Quality <br /> Control Board-Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> Re: 1991 Third quarter sampling report, Sung 5 property, <br /> Tracy Estates, 400 South Tracy Boulevard, San Joaquin <br /> County <br /> Dear Ms. Vorster: <br /> This letter presents the results of our third quarter 1991 <br /> groundwater monitoring and sampling at the Tracy Group Partnership <br /> property (Figure 1 ) . During monitoring, depth to water was <br /> measured, the wells were purged, and after stabilization of <br /> electrical conductivity, pH and temperature samples were collected <br /> for analysis. <br /> The laboratory results for the July 9, 1991, sampling detected no <br /> purgeable halocarbons and aromatics (EPA 601/602 by 8240) or total <br /> petroleum hydrocarbons and polynuclear aromatic hydrocarbons (EPA <br /> 8270) above method detection limits in monitoring wells MW1, MW2, <br /> MW3 or MW4 (Table 1 ) . Attachment 1 contains the laboratory data <br /> sheets and chain-of-custody documentation. <br /> Groundwater monitoring performed on July 9, 1991 indicates the <br /> water table risen approximately 0. 5 feet since April 1991. Using <br /> the monitoring data, a gradient map was created with a computer <br /> Kriging program (Figure 1 ) . The direction of gradient is <br /> consistent with previous monitoring and is to the northeast, but <br /> the magnitude is 0.0005 which is less than the April 1991 <br /> TGPLR0909.WP <br />