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May 23, 1986 <br />86-1114.21 <br />Southern Pacific Pipelines, Inc. <br />Attention: Mr. John J. Spinelli <br />Subject: Work Plan <br />Page 2 <br />north of the new pipe section. <br />M2 item 4: We have considerable sieve analysis data for soils in the Holt <br />area. Filter criteria and screen slot size will be based on thorough <br />evaluation of material properties. <br />M1 item 5, M2 item 5: Since the wells are shallow development by <br />mechanical pumps will be more efficient and will be done. <br />M1 item 6: Two-inch wells require much less volume of water to be purged <br />for proper development (approximately one fourth) compared to four-inch <br />wells. They also have a much quicker response time to water level <br />fluctuations in the aquifer. Since no difficulty is anticipated in <br />development of two-inch wells at this site, the two-inch wells were <br />proposed and will be used. <br />M2 - item 6: The Diedrich sampler holds three 6-inch liners. Each drive <br />sample yields three soil samples. In case of "split" samples, the two <br />adjacent liners (the middle and bottom) will be used for testing. One will <br />be sent to the main contract laboratory and other will be sent to another <br />contract laboratory for QA/QC purposes. We hope this explanation clarifies <br />the intent in the last sentence in Section A.1.3. of the Work Plan. <br />M1 item 7: Prior to sampling wells will be purged until readings of <br />temperature, pH, and specific conductance are stabilized. Samples will be <br />collected with a teflon bailer. <br />M1 item 8: At this point three monitoring wells are planned. Additional <br />monitoring wells, if needed, will be recommended and constructed. <br />MI item 9, M2 item 7: Volatile aromatics do degrade the PVC in time. If <br />the purpose of the monitoring wells was long term monitoring of groundwater <br />quality in a waste management pond, then stainless steel or teflon screens <br />and pipes would have been recommended. However, for the short duration of <br />this project we feel PVC will maintain its integrity. In a number of <br />similar projects we have seen that PVC pipes and screens function properly <br />for two to three years. We therefore recommend to use PVC in this project. <br />M2 item 8: The phone number for fire department, ambulance/paramedics in <br />Stockton/Holt area is 464-4646. The nearest hospital is San Joaquin <br />General Hospital, Tel. 982-1800. This will be added to the list of <br />emergency numbers in SSOP. <br />M1 item 10, M2 item 9: A description of the disposal of the collected